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[lossy]

I have of course joined this forum because I have a problem, But I am from Southern England and was happy to see a Omega forum, shocked I did not know about it
since I have had Carltons and then moved on to Omegas (Reluctantly).

I have a 2.6 Y26SE which has had the engine management light on for 3 years normally coming on at high acceleration or > 100 mph.
I am not new to Vauxhall Omegas and have had ~ 7 or 8 in the past, but always 2.6 V6s and 3.0 V6s

The fault says I have a MAF issue which I was replace just before I bought it for £700 and I also took it to get replaced which did not fix it.
I then took it to a Vauxhall garage this year to get it service/AC fixed/ MAF fixed and a new key. They broke the Oil filter cover and just serviced it and charged me £600
No air con fix/no spare key and said the ECU/ECM might be broken and they cannot fix it because the car is too old

Does anyone know how to use Temp-2 or "My Naff Code Reader" to clone the ECU and also get the security code out of the ECU I have on the car?
I do have a Y26SE donor ECU.
The car has become very unhappy with the new E10 petrol so have to use E5 petrol, but it still does not like that either. The car has only done 65,000 miles and I do not want
to throw another one away to the scrap yard.

When I took it to the main dealers I knew it would be bad, as the last Omega I took to a main dealer they serviced it as a 4 cylinder car and said it was running really rough.
I opened the bonnet and asked them if the two spark plugs sitting in the engine bay was something to do with the miss fires.
I was expecting the bill to be ~ £2000 and would have been happy with that if they had fixed something, but since I have never been a fan of servicing a vehicle and I used to do ~ 70,000 miles
a year getting things serviced used to be too time consuming. So I used to buy a Vauxhall with ~ 50,000 miles and take it to 140,000-150,000 then scrap it ensuring I keep the winter tyres.

Any help with the ECU/ECM would be much appreciated. I bought the Temp-2 ODBII diagnostic machine and "My Naff Code Reader" just for this reason to reset or clone the ECU.
If any Mechanics can fix it that would be even better - I am just a computer consultant who thinks a firmware upgrade fixes everything.

[dave the builder]

Y26SE is OBD2 compliant ,so have you put a code reader on and read the fault codes ?
I doubt the ECU or firmware is the issue
you need to get the Omega looked at by someone who knows Omegas
many people take Omegas to Serk at SAS automotive
someone will be along to advise you how to contact him , i don't have his details

[Raeturbo]

Like Dave says take advantage of this forum you will find loads of help here. Don’t take it anywhere unless it has been mentioned here as it seems like you have had a rough time with garages so far..👍

[lossy]

Like Dave says take advantage of this forum you will find loads of help here. Don’t take it anywhere unless it has been mentioned here as it seems like you have had a rough time with garages so far..👍

I am just a repair brakes, tyres (Rotate in Winter) and exhaust person - most of the time the Omegas do not need work and the same was with the old Carltons. I do have 2 trusted garages that try their best at fixing things so some garages
you can have a good relationship with.

I filled a leaking a Omega radiator up with 2 bottles of Radweld Gold once, because the water was leaking out within a day @80,000 miles (not this car) - I took the car to the Alps from the UK the next day and drove most of the way @ 140mph
and came back without issue. The car lasted another 60,000 miles, I think I blocked the cooling system as it was like mud in the bottle, when I purchased that car the oil appeared to have water ingress into the engine as the oil was milky.
When you purchase an Omega at only £700 you take that risk knowing that the Omega normally will not let you down. I bought this one with the same MAF engine management system light on 3 years ago and it is still working just think it is time to fix it and
luckily it is a 52 plate so will pass an MOT with warning lights on the dash, even though I could turn it off for the test.

That is why I like them they are fairly bullet proof and I am a little tough on my cars.

I will play with the TECH-2 today as I have already stored the information on the PCMIA card for my Car via the ODBII port - Still unsure what the Candi device does.

[Nick W]

Like Dave says take advantage of this forum you will find loads of help here. Don’t take it anywhere unless it has been mentioned here as it seems like you have had a rough time with garages so far..👍

I am just a repair brakes, tyres (Rotate in Winter) and exhaust person - most of the time the Omegas do not need work and the same was with the old Carltons. I do have 2 trusted garages that try their best at fixing things so some garages
you can have a good relationship with.

I filled a leaking a Omega radiator up with 2 bottles of Radweld Gold once, because the water was leaking out within a day @80,000 miles (not this car) - I took the car to the Alps from the UK the next day and drove most of the way @ 140mph
and came back without issue. The car lasted another 60,000 miles, I think I blocked the cooling system as it was like mud in the bottle, when I purchased that car the oil appeared to have water ingress into the engine as the oil was milky.
When you purchase an Omega at only £700 you take that risk knowing that the Omega normally will not let you down. I bought this one with the same MAF engine management system light on 3 years ago and it is still working just think it is time to fix it and
luckily it is a 52 plate so will pass an MOT with warning lights on the dash, even though I could turn it off for the test.

That is why I like them they are fairly bullet proof and I am a little tough on my cars.

I will play with the TECH-2 today as I have already stored the information on the PCMIA card for my Car via the ODBII port - Still unsure what the Candi device does.

You are trying to run before you can crawl.


A 2.6 is EOBD compliant, so a basic £10 reader would give any of us a good place to start diagnosing your fault. A Tech II probably isn't necessary, although one would save time for someone who knows how to use it.


Your 'trusted garages' ought to be able work on your car, although they might not be the most efficient at it.


Throwing money at the bit you don't understand is going to cause you a lot of expensive trouble.

[lossy]

I have always had these cars so I thought buying a Tech-2 with the CANdi unit would probably pay for itself eventually, I do have a EML Bluetooth ODBII with the app  Torque (lite) to reset on my phone the engine management  light off when I have accelerated too quickly, those EVs are very quick at accelerating off the line

I known that there was only 130 of my Vauxhall 2.6V CD Autos on the road in Q2 2021 but so I would imagine that I might end up having to buy an Insigna or and EV next, but I only like cars with a boot,

[Doctor Gollum]

The donor ecu is of no value without a car pass, corresponding key chip and transponder.

The oil filter cap/housing is easily fixed with a threaded bush and a spin on filter for circa £10.

But you already know the dealer screwed you over...

The chances are that either the new MAF is faulty or you have an actual fault, probably a vacuum leak.

Either way it won't be the ecu

[TheBoy]

To answer questions posed....

If its the original ECU, security code is on the Carpass in the drivers glovebox handbook folder. If this is lost, a new carpass is availiable from a Vauxhall dealer for around £30-50, depending on how much of an arse they are. Shop around the dealers

No way to get security code from Engine ECU using plug-in diags tools.  As far as I'm aware, nobody has worked out how to do it by dumping the EEPROM either.

Security code can be retrieved from the alarm ECU via an EEPROM dump...   ...but EEPROM is varnished over, so its a pain.

High spec (generally 3/3.2l Elites) can get the security code from a EEPROM dump from the headunit if its the original.


Replacing the ECU will result in immobiliser issues, unless engine ECU can learn the immobiliser, which needs the security code.  Only way round this is to replace ECU/Immob and all transponders from a donor, and probably not the best way to do it.

Tech2 CANdi adapter is not needed on any Omega, as they are not CAN Bus based.  Its for the few CAN cars like Vectra-C, Astra-H and Corsa-D (Insigina/Astra-J etc don't use Tech2 for diags).

Tech2 needs to be "authorised" by TIS to do anything beyond diagnostics.  This requires a valid TIS subscription (or alternative means to make it think its got a valid TIS subscription).

Engine ECU faults are rarer that rocking horse shite on Omegas, so doubt that's your issue.  I think I've seen one (a 3.2 one, surged by incorrect use of an old fashioned charger) in all the time I've had a Tech2.

Don't rule out loom faults, as these cars are getting old now.

Make use of the Live Data of Tech2 to monitor the live readings from the various sensors you suspect.  But remember, thats what the ECU *thinks* its seeing, not a dead cert confirmation to swap a part

[lossy]

I think this car has had this fault for so long now and is why it has done so few miles - I knew it was a long shot to take it to a main Vauxhall dealer and I did suspect the loom as I am getting readings from the ECU just not the MAF.
Since I put Redex in the car the fuel mixture has become so bad I am amazed I have not broken down.
CANdi unit on the Tech-2 bought just to future proof, Well who should I take my car to be fixed in the Oxfordshire area?

I have a misfire on pot 4,a AC voltage issue and the MAF issue but other than that the Faults are clean.

I would like a nice reliable rust bucket (does have some on the wheel Arches). I need someone to pimp my ride

[TheBoy]

So what are the LTFT's for Bank 1 and 2 (on Tech 2, Diags, pick car, then engine, then Data Display).  Whilst there grab MAF reading with car at idle, A/C off.