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[robinwhale]

I have had an intermittent MIL light showing for a while and (following advice from this forum) got hold of a code reader, diagnosed my P1555 code and cleaned the throttle body. All good so far - no MIL for days!

However my (2001 2.2 manual petrol) Omega seems to be struggling to breath correctly. On cold she is a bit lumpy but better when warmed up. I have an occasional misfire and there are times during normal driving when it feels like there is not enough petrol getting through but if I floor the pedal she takes off like a scalded cat.

My D900 EODB/ODBII code reader does not register any error codes but if I have it recording live data as I drive the FUEL SYS1 reads OL FAULT. I found a reference to this on another forum (Chrysler I think) where the problem was solved by replacing the O2 sensor.

Do I have the same O2 sensor problem on my Omega? If so, which sensor is it and where is it located?

I am not a very mechanical person but I'm not afraid to get my hands dirty. The guides on this forum are very useful, especially the ones with plenty of pictures and written with the idiot in mind.

[zirk]

O2 or Lambda Sensor(s), not sure if theres 1 or 2 on the 2.2 are situated at the bottom of the Down Pipe after the Cats.

Dont think I would be looking at changing them at this stage though as they can report faults due to other issues, ie, over or under Fuelling or Air mixture, or partially blocked Exhaust to name a few.

Out of interest any codes showing if you do a Peddle Trick test?

[robinwhale]

Peddle trick worked well. Didn't know you could do that.

Codes generated were:

0130
1555
0170
0302
0303

FYI: I have had a new mid section of exhaust fitted recently for the MOT which it passed on 21st January

[zirk]

P0130   O2 Sensor 1 Circuit Voltage High 
P0130   O2 Sensor 1 Circuit Voltage Low 
P0130   O2 Sensor 1 Open Circuit 
P0130   O2 Sensor 1 Incorrect Signal

P1555   Throttle Position Sensor (TPS) Load Signal not Plausible with Engine Load

P0170   Lean Exhaust 

P0302 and P0303 isnt listed, but is normally associated with - Cylinder Misfire Detected, within ODB2

[TheBoy]

Peddle trick worked well. Didn't know you could do that.

On a 2.2 petrol

[RobG]

Peddle trick worked well. Didn't know you could do that.

On a 2.2 petrol

A tiny minority will "pedal trick"

[robinwhale]

The 1555 is the fault I initially addressed by stripping the throttle body and cleaning it (especially the tiny breather hole that was blocked).

The others suggest it is O2 sensor 1 which is the root cause which has the secondary effect of causing the misfires on cylinders 2+3 (0302 and 0303).

Next task is to work out which is the o2 Sensor1 - is it the lambda sensor indicated in the 5th picture at http://www.omegaowners.com/forum/index.php?topic=90645.0?

[RobG]

The 1555 is the fault I initially addressed by stripping the throttle body and cleaning it (especially the tiny breather hole that was blocked).

The others suggest it is O2 sensor 1 which is the root cause which has the secondary effect of causing the misfires on cylinders 2+3 (0302 and 0303).

Next task is to work out which is the o2 Sensor1 - is it the lambda sensor indicated in the 5th picture at http://www.omegaowners.com/forum/index.php?topic=90645.0?

Yep

[robinwhale]

is it the lambda sensor

Yep

Thank you. Will see about getting it replaced. Any recommendations where to buy online?

Will also check the plugs as it occurred to me that if it was a "common" item (MAF, fuel pump, etc) causing the misfires then all cylinders would misfire not just two. This suggests to me coil pack or plugs. Coil pack I would think would give me a MIL light. Both plugs and coil pack were replaced couple of years ago - 10,000-15,000 miles at most. Will have a look tomorrow.

[zirk]

The 1555 is the fault I initially addressed by stripping the throttle body and cleaning it (especially the tiny breather hole that was blocked).

The others suggest it is O2 sensor 1 which is the root cause which has the secondary effect of causing the misfires on cylinders 2+3 (0302 and 0303).

Next task is to work out which is the o2 Sensor1 - is it the lambda sensor indicated in the 5th picture at http://www.omegaowners.com/forum/index.php?topic=90645.0?

Faulty O2 sensor is unlikely to cause 2 cylinders to missfire, other way around would make sense, if the O2 sensor is faulty or more likely reading and giving wrong signals it would make the engine run rich, lean or lumpy.

Is it missfiring?, have you check Plugs and Plug Wells for Oil, Water. if it is the O2 on its way could be the heater on the sensor is playing up and not doing its job when cold. 

[robinwhale]

Considering the weather recently I think an examination of the plug wells could be in order.

On another point altogether, I have just checked my V5C log book/Registration Certificate and for D3. Model it says OMEGA GLS V6.
Does this mean that the DVLC thinks I have a V6 engine and not an inline 4? It had cylinder capacity as 2198cc and CO2 as 236 G/KM. Does that sound right? Have I been paying too much road tax/insurance for the last few years?

[martin42]

2 puffs of ventolin inhaler should do the trick lol

[Kevin Wood]

Don't forget that O2 sensor readings can also be foiled by air leaks into the exhaust and intake systems.