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Author Topic: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)  (Read 34990 times)

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jandroa

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Hi everyone! Opel Omega 2.6 V6 (Y26SE) owner here. Some weeks ago my Omega check engine light came on. The errors codes were P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2). I inmediately took the car to the official Opel workshop in my town. They had the car for about a week and did all sort of tests, but they didn't found anything wrong, so they just erased the error code to turn off the check engine light. I was told that the lambda sensor data was OK. They returned the car to me, and only 50km later, the check engine light is back.

The car is running right and there is nothing wrong in terms of functioning, performance or noises.

Should I be concerned about it? Do you have any experience with this issue and know what could be the reason behind the check engine light?

I would be grateful if you could point me in the right direction.

Thank you in advance.
Alex.

Edit: Add more information.
« Last Edit: 17 August 2024, 20:15:21 by jandroa »
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #1 on: 18 August 2024, 10:33:38 »

Does the car run on LPG? If so, might need to get LPG remapped.

Does the car have an aftermarket oiled air filter? If so, pop a stock one on.


Otherwise, are the trims high or low (positive or negative on a 2.6/3.2, or less or more than 127 on an older one).  Ideally you need to read the live data off it for the LTFT, and also the MAF

If you don't have the capability to obtain live data, check for air leaks in the intake system, ir exhaust leaks around or near the manifolds.
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jandroa

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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #2 on: 18 August 2024, 18:50:11 »

Thank you for the suggestions!

The car runs on petrol (E10) and as far as I know the air filter is original (last change was done at the official Opel workshop a couple of years ago).

Today I got a cheap scanner to read some live data from the OBD2 port. The STFT was fine, making small corrections but always very close to 0.0 (both above and below zero). However, the LTFT showed the value at 25 which I think is very high. I guess this is the maximum value until the check engine light activates. The strange thing is that the car behaved well, with no apparent signs of air leaks.

The MAF sensor values were fine  (I am far from being an expert), 2.3 at idle.

Thank you!



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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #3 on: 18 August 2024, 22:19:16 »

My 2.6 runs on E10 ok, but it seemed that the lamdba code came up a lot more with e10, so I just use e5, if on occassion it does come on I just disconnect the battery for a while. Fuel consupmtion also much higher on E10.
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #4 on: 19 August 2024, 08:07:01 »

The MAF sensor values were fine  (I am far from being an expert), 2.3 at idle.
The correct reading for a 2.6's MAF at idle is about 12kg/hr, which is:
12,000/60 = 200g/min
200/60 = 3.33g/sec
(assuming my maths is right)

2.3 (presumably) g/s = 8.2kg/hr, which seems a little low to me.  Which usually means unmetered air getting in by not going through MAF (or MAF has developed a fault, though Omega MAF's are bomb proof if not oiled by a filter or sprayed with cleaners)


And, yes, around 25% of trim (+ve or -ve) is where it brings on a trim malfunction.
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jandroa

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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #5 on: 19 August 2024, 09:12:44 »

My 2.6 runs on E10 ok, but it seemed that the lamdba code came up a lot more with e10, so I just use e5, if on occassion it does come on I just disconnect the battery for a while. Fuel consupmtion also much higher on E10.

That is interesting, I never though E5 comsumption would be lower than E10. I will give a try!

The correct reading for a 2.6's MAF at idle is about 12kg/hr, which is:
12,000/60 = 200g/min
200/60 = 3.33g/sec
(assuming my maths is right)

2.3 (presumably) g/s = 8.2kg/hr, which seems a little low to me.  Which usually means unmetered air getting in by not going through MAF (or MAF has developed a fault, though Omega MAF's are bomb proof if not oiled by a filter or sprayed with cleaners)


And, yes, around 25% of trim (+ve or -ve) is where it brings on a trim malfunction.


That is a little bit confusing to me because the MAF says the airflow is a little low but the LTFT at 25% says it has a lot of air so it's injecting more fuel, isn't it? As you said, maybe the unmetered air is not passing through the MAF or the MAF has developed a fault.

I will ask the mechanic to check the MAF, the lambda sensor and if there is any point where air can enter, a damaged hose or something like that.

Thank you!
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #6 on: 19 August 2024, 09:47:47 »

That is a little bit confusing to me because the MAF says the airflow is a little low but the LTFT at 25% says it has a lot of air so it's injecting more fuel, isn't it? As you said, maybe the unmetered air is not passing through the MAF or the MAF has developed a fault.
Its a petrol engined closed loop system so...

It injects fuel based on incoming air.  The lamdas detect its running too lean, because more air is coming in that it thinks, so ecu increases trim (increases injector duration).
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #7 on: 20 August 2024, 09:44:03 »

hi,
i have a 2.6 too, and i had this error code around one month ago
this occoured when i had a just little amount of fuel in the tank and i drove on serpentine roads, when i think the fuel is was too low, and and the pump cannot recivie the right quantity.
i refulled and i dont have this code anymore
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jandroa

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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #8 on: 20 August 2024, 11:44:15 »

Its a petrol engined closed loop system so...

It injects fuel based on incoming air.  The lamdas detect its running too lean, because more air is coming in that it thinks, so ecu increases trim (increases injector duration).

Ok, I will erase the error code and check again if the LTFT rises.


hi,
i have a 2.6 too, and i had this error code around one month ago
this occoured when i had a just little amount of fuel in the tank and i drove on serpentine roads, when i think the fuel is was too low, and and the pump cannot recivie the right quantity.
i refulled and i dont have this code anymore

Thank you for your information, I will ensure that my tank is not too low  :)
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jandroa

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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #9 on: 21 August 2024, 19:19:02 »

Hi everyone, after clearing the error code and driving for a few hours, the check engine light does not come on, but if I connect the OBD scanner it shows me the error codes P0170 and P0173 again.

The car is running as always, there are no significant changes in rpms at idle, no loss of power when accelerating...nothing unusual.

Checking the scanner measurements again it shows me the following data:

RPM (at idle): around 650rpm
MAF (g/s): 3.5
STFT1 and 2, changing between -3% and 3%.
LTFT 1 and 2: 25%
O2B1S1: changing between 0,085 and 0,900
O2B1S2: around 0,700
O2B2S1 and S2: similar values than B1.

If the car had an air leak, shouldn't it be noticeable in the rpms at idle, or even when the car moves? Can a faulty sensor bring the LTFT to 25% even if the car is running properly?

Thank you!!

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jandroa

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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #10 on: 22 August 2024, 11:33:13 »

Additional info: I have seen that besides de STFT is ok at idle, as soon as the rpm goes higher, the STFT goes above 14-15, making the LTFT reach 25 at the long term.
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #11 on: 23 August 2024, 09:44:49 »

Reset fault codes (which on a 2.6, if there is a stored code, should reset the BLMs)

Confirm LTFT is 0%, and stays at 0% when idling for a few minutes.

Increase revs, and see if LTFTs rise. And if both banks rise at around same rate.


I'm wondering if its sucking unmetered air, but only at higher revs.
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #12 on: 23 August 2024, 09:46:54 »

Also worth checking that the B!&2 Sensor 1's are flicking between rich and lean at about 1Hz once it goes closed loop.  On the Tech2, this figure is called ratio, but might be called something else on other scanners.

If its not alternating, or doing so slowly, this can be a sign of a tired sensor.
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jandroa

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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #13 on: 23 August 2024, 15:04:33 »

Reset fault codes (which on a 2.6, if there is a stored code, should reset the BLMs)

Confirm LTFT is 0%, and stays at 0% when idling for a few minutes.

Increase revs, and see if LTFTs rise. And if both banks rise at around same rate.


I'm wondering if its sucking unmetered air, but only at higher revs.

This is exactly how it worked, resetting the fault codes put the LTFT at 0%. When idle, LTFT remained at 0% and STFT varied between -3%, +3%. When I increased revs to 2000 and held it for about three minutes, STFT went up to 14-18%, and LTFT began to increase, both banks at the same rate, up to 0,8%.

As you said, it seems to be sucking unmetered air only at higher revs, at idle it's ok.

Also worth checking that the B!&2 Sensor 1's are flicking between rich and lean at about 1Hz once it goes closed loop.  On the Tech2, this figure is called ratio, but might be called something else on other scanners.

If its not alternating, or doing so slowly, this can be a sign of a tired sensor.

As for the B1&2 sensor, I am afraid my cheap scanner is not giving me the ratio or anything like that, just the voltage.
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polilara

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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #14 on: 24 August 2024, 11:15:20 »

https://www.omegaowners.com/forum/index.php?topic=149556.0;all

If you check this you can see my Y26SE with old and new sensors, mV...
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #15 on: 26 September 2024, 20:39:51 »

We found a disconnected small tube near the intake manifold with a smoke machine. We have put it back in and now we have to drive the car to see if the consumption returns to normal.
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #16 on: 26 September 2024, 23:02:39 »

That's the vacuum line between the throttle body and the fuel pressure regulator.

Really easy to miss if you remove the TB or plenum as it will fall out on a whim if disturbed.
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #17 on: 09 October 2024, 21:03:32 »

Hello everyone, despite the repair, the car continues to use a lot of fuel. The mechanic told me that it may take time to stabilize consumption after repairing the vacuum leak, is this normal?

I have reset the LTFT values as well as the average consumption calculated in the on-board computer.

Thanks!
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #18 on: 10 October 2024, 12:16:52 »

If you reset trims, it should learn the new values, which should be 0%, within a couple of miles, then refine constinuously.
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #19 on: 10 October 2024, 12:33:15 »

Would running the fuel pressure regulator without a vacuum potentially damage the diaphragm :-\
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #20 on: 10 October 2024, 12:58:14 »

it shouldnt do as the spring will be holding it closed and if the diapragm split you would know about it with pressurised fuel squirting out of it ( the vac port)
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #21 on: 10 October 2024, 13:24:34 »

it shouldnt do as the spring will be holding it closed and if the diapragm split you would know about it with pressurised fuel squirting out of it ( the vac port)
Would that count as over fuelling if it was being hoovered in by the throttle body :-\
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #22 on: 10 October 2024, 13:31:01 »

definately but it would be sending in a heck of a lot unless its a slight pinhole
with the engine running (or pump) nothing  should be coming out of there ! 
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #23 on: 10 October 2024, 20:15:12 »

If you reset trims, it should learn the new values, which should be 0%, within a couple of miles, then refine constinuously.

I will check if it learn the new values and keep them consistently near 0%.

definately but it would be sending in a heck of a lot unless its a slight pinhole
with the engine running (or pump) nothing  should be coming out of there ! 

That sort of things should be easy to notice, isn't it?
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #24 on: 10 October 2024, 22:26:01 »

Is the high fuel consumption a new thing having driven the car 1,000s of kilometres? Or is it high compared to previous/other cars you have?

9.4l/100km would be a reasonable good average, significantly higher if you only drive short distances or around town.
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #25 on: 11 October 2024, 07:32:52 »

Fuel consumption of this car used to be about 10,5l/100km (with 1000s of kilometers driven in the past), now it has increased to 15-16l (it fluctuates a lot because since the car was repaired I have not driven enough kilometers to let the car calculate a consistent average).

Is it true that since the repair I have only driven short distances in town. Maybe all I need is to wait and drive more (especially out of town).
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #26 on: 11 October 2024, 08:55:08 »

I sometimes check the (minimum) fuel consumption of my 2.6 Elegance so that I go to highway and accelerate to 85 km/hour, put cruise on and reset the average fuel consumption value from the car display. After a couple of kilometers I can see average consumption below 9 litres/100km. Can you do this in your Omega and have you tested this?
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #27 on: 11 October 2024, 09:02:52 »

That's a great idea, I'll check it out as soon as possible.

Driving in town now it has a very strange behaviour (at least for me), if I reset the average fuel comsumption and drive at a stable speed, the average consumption goes down, but when I stop the car at a traffic light, the average comsumption starts to increase again.

I will get back with the result of this test.
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #28 on: 11 October 2024, 09:16:25 »

That's a great idea, I'll check it out as soon as possible.

Driving in town now it has a very strange behaviour (at least for me), if I reset the average fuel comsumption and drive at a stable speed, the average consumption goes down, but when I stop the car at a traffic light, the average comsumption starts to increase again.

I will get back with the result of this test.
That's down to how the computer works. It sees the fuel flow/speed. When speed is Zero  it can't accurately process the fuel consumption, so the consumption becomes a poor guesstimate.

Also, cold start enrichment cripples the consumption until the engine is up to temperature, so a car that is only driven 12-16km from cold will never warm up properly and will severely impact the fuel economy of one that is driven for some time.

The difference in fuel used between a cold start  journey of 12km vs one of 24 is negligible.

Point being that if the fuel consumption is within the range of other Omegas, then it's something that you can either live with or not, but if it's significantly worse then consider the various temperature sensors and the thermostat. ;)
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #29 on: 11 October 2024, 09:33:37 »

Thank you so much for the explanation, it all makes sense to me now.

I'll try to do the test that @polilara told me and also wait until I have driven a significant number of kilometers excluding short distances in town which are not representative of the car's real average fuel consumption.

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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #30 on: 13 October 2024, 08:24:07 »

Hello, I take advantage of the topic to comment that for a few days I also have problems with high LTFT. Suddenly I observed an increase in consumption and the LTFT values ​​are over 10-14%. I have checked the vacuum lines and everything seems to be fine, the lambda probes have 45,000 km but it is rare for both to break at the same time. The MAF has about 30,000 km, it seems strange to me that it fails so soon. Any ideas on what to start looking at?
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #31 on: 13 October 2024, 08:33:08 »

Hello, I take advantage of the topic to comment that for a few days I also have problems with high LTFT. Suddenly I observed an increase in consumption and the LTFT values ​​are over 10-14%. I have checked the vacuum lines and everything seems to be fine, the lambda probes have 45,000 km but it is rare for both to break at the same time. The MAF has about 30,000 km, it seems strange to me that it fails so soon. Any ideas on what to start looking at?


In my case all vacuum lines seemed to be fine, until the mechanic checked them with a smoke machine, maybe you can check it too the same way.
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #32 on: 21 October 2024, 08:31:54 »

We are back to the problem, the errors P0170 and P0173 have appeared again, I will take it to the mechanic to have it checked again. The vacuum leak (loose tube) has already been repaired, since then about 300km have been driven.
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #33 on: 26 October 2024, 08:57:40 »

The first lambda sensor will be changed next tuesday, I will post the results after that.
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #34 on: 22 December 2024, 09:29:19 »

Long story short - We found a disconnected small tube near the intake manifold that seems to have damaged the lambda sensors and triggered errors P0170 and P0173.

After repairing the leak and replacing one of the lambda sensors (B1), the P0170 and P0173 errors reappeared. A few days ago the second lambda sensor (B2 - precat) was also replaced. Now I am testing the car to see if the problem is solved. Fuel consumption appears to be back to normal.

My mechanic says that a single faulty lambda sensor can trigger both bank errors (P0170 and P0173) and that the MAF has nothing to do with these errors and with both sensors replaced the problem should go away.
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #35 on: 22 December 2024, 10:48:59 »

There's more than one vacuum line. They all do different things but they all come from one source... The inlet manifold.

Hopefully you have found, and fixed, the last of them.

It will take a while for the the sensors to settle down. O2 sensors are pretty robust. If one isn't working correctly then you need to look at the wiring as part of the diagnostic process, but if the readings are out of whack both sides,. that's not coincidence and you might have killed the cats overfuelling it from the vacuum leak or the ECU holding the injectors open (because of the vacuum leaks).

You could replace all four sensors, the injectors, wiring harness and ECU and still have the same problem.
« Last Edit: 22 December 2024, 10:55:27 by Doctor Gollum »
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #36 on: 22 December 2024, 11:03:04 »

That makes perfect sense, however I would say the cats are not (too much) damaged, the vehicle recently passed the inspection and had no problems with the emissions test.
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #37 on: 22 December 2024, 12:02:28 »

If the pass grade is 40% of what the cats are capable of, then they can be 60% dead. For example.

That difference might be enough for the sensors to be reading out of the predetermined range hence the error codes.

The fact you have codes both sides suggests a problem common to both sensors... Statistically it's not going to be the sensors.

You could try filling it with Shell V power and taking it for a spirited drive of at least 50 miles just to ensure that everything is properly upto temperature and working as it should.

Pootling around town 10-15 miles at a time will make it worse. Especially this time of year.
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #38 on: 22 December 2024, 14:00:45 »

I understand, thank you for the tip!, I will try it as soon as i can.
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #39 on: 25 December 2024, 10:12:34 »

Most likely down to the first small cats on the downpipe failing, try running e5 petrol and if no better just remove the eml bulb as unless you replace both downpipes inc the cats it will continually occur.
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #40 on: 25 December 2024, 10:26:56 »

Eml light constantly on used to drive me mad. Now I dont really notice it. I just clear the code to put the light off for the MOT once a year.  :)
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #41 on: 25 December 2024, 12:21:23 »

I use a small piece of insulating tape to turn off.er, hide it on the Vectra. It is off at the moment so it must have been the dodgy rear box.  :-\
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #42 on: 04 January 2025, 22:42:41 »

Back to the start, the errors P0170 and P0173 have appeared again after repairing the air leak and changing the two lambda sensors... I will ask the mechanic to change the air filter and clean the MAF sensor, maybe change the fuel filter too, I hope there isn't another hidden leak somewhere.
« Last Edit: 04 January 2025, 22:49:44 by jandroa »
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #43 on: 05 January 2025, 21:38:52 »

Don't clean Omega MAF sensors, you *WILL* shag them.
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #44 on: 05 January 2025, 22:03:24 »

Why? Maybe it is better to change it directly?
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #45 on: 05 January 2025, 23:12:53 »

Back to the start, the errors P0170 and P0173 have appeared again after repairing the air leak and changing the two lambda sensors... I will ask the mechanic to change the air filter and clean the MAF sensor, maybe change the fuel filter too, I hope there isn't another hidden leak somewhere.
You assume you have found and fixed ALL the vacuum leaks.
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #46 on: 06 January 2025, 19:03:16 »

I will definitely ask the mechanic tomorrow to check for more vacuum leaks in the system.
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #47 on: 06 January 2025, 21:12:07 »

All the vacuum on the car comes from the intake/plenum. There are also several seal between the throttle body and the cylinder heads. Any one will allow un metered air in if not fitted correctly or in good condition.
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #48 on: 07 January 2025, 15:04:00 »

Why? Maybe it is better to change it directly?
Many have tried, all have cried....
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #49 on: 07 January 2025, 19:09:40 »

Why? Maybe it is better to change it directly?
Many have tried, all have cried....
The original MAF on my Plod died,.so put a new Bosch one on that lasted six months, refitted the original one with no further issue.

That car did have a fault within the engine harness which was replaced whilst the new MAF was installed so it's possible that the original MAF was fine and the issue was actually elsewhere.
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #50 on: 13 January 2025, 12:25:04 »

The mechanic told me that the OBD2 was now reading a fuel system related code, so he started changing the fuel filter. Check engine light has gone for the moment and now is time to continue driving to see if the issue is resolved.
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #51 on: 13 January 2025, 12:38:34 »

The mechanic told me that the OBD2 was now reading a fuel system related code, so he started changing the fuel filter. Check engine light has gone for the moment and now is time to continue driving to see if the issue is resolved.
It helps to give the code if you're seeking advice ;)

I suspect a purge valve or charcoal canister issue as they are the only parts of the fuel system that might generate a system specific code unless you have a faulty injector.

That said, now the cambelt has been changed, and assuming it was set correctly, you may (not) find that the issue you had was corrected with the cambelt change and stemmed from incorrect timings.
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #52 on: 13 January 2025, 13:15:07 »

I'm sorry but he didn't told me the exact error code, he just told me it was related to the fuel system and this time he couldn't clear the code until he changed the fuel filter.

I will try to do as many kilometres as I can these days to see if the problem is solved.

Thanks!
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #53 on: 04 February 2025, 09:10:18 »

Hello, I continue to have problems with high LTFT, a problem that is aggravated in lpg. I have checked vacuum tubes and changed MAF and it remains the same. What else could a high LTFT produce? Any idea what else to look at? Do you think that the failure of a multiram valve could create it?
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #54 on: 04 February 2025, 10:23:34 »

Only if there's a vacuum line that you've missed.
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #55 on: 04 February 2025, 11:20:41 »

I haven't missed any, in fact when disassembling the multiram the air leak sounded when disconnecting the air accumulator pipe. Can there be a leak in the brake booster? I don't notice anything strange but I don't know what to think anymore
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #56 on: 04 February 2025, 12:27:33 »

from what i remember there is a part of the brake booster pipe that can rub through and cause a leak ?  if it's missing it's plastic bracket / spacer .
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #57 on: 04 February 2025, 13:31:17 »

There's a take off for vacuum on the servo line.
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #58 on: 04 February 2025, 15:48:09 »

That vacuum line of the brake booster already broke down and affected the brake and the weather that only threw hot air at my feet in summer. Now I don't notice any of that, I can only think that some valve of the multiram can cause it, since it is the only thing I have left and that the problem is not continuous, maybe 3-4 times in these months it has gone well, but the next day bad again
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #59 on: 04 February 2025, 15:55:27 »

from what i remember there is a part of the brake booster pipe that can rub through and cause a leak ?  if it's missing it's plastic bracket / spacer .
This. It rubs through against an AC line iirc
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #60 on: 04 February 2025, 15:58:19 »

And the line that always gets missed between the TB and the rear multiram accumulator.

Not to mention the Top hat seal of it splits when the breathers are disturbed...
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #61 on: 04 February 2025, 20:18:43 »

What seal? Where is?
« Last Edit: 04 February 2025, 20:22:51 by olm »
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #62 on: 04 February 2025, 22:48:04 »

Under the breather bridge.

If you press or lift the Ecotec plate on top of the plenum with the engine running as you spray carb cleaner along it and you hear the engine rpm change, that's your leak.
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #63 on: 05 February 2025, 12:44:57 »

have you got ( or can you make or borrow) a smoke machine tester ?
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #64 on: 06 February 2025, 22:13:44 »

Under the breather bridge.

If you press or lift the Ecotec plate on top of the plenum with the engine running as you spray carb cleaner along it and you hear the engine rpm change, that's your leak.

Ok, I will see, thanks
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #65 on: 06 February 2025, 22:17:00 »

have you got ( or can you make or borrow) a smoke machine tester ?

No, but I'm thinking of doing one  ;D
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #66 on: 07 February 2025, 08:19:58 »

plenty of home made ideas on youtube . even saw one where someone used a vape pen !
at the end of the day ( and especialy if its not something you are going to use regularly ) any method of producing and pushing out some kind of smoke will work !
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