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[amigdalo]

I have a vauxhall omega for nearly 5 years. Last few months the engine light came on and a tiking noise from the engine.
I left this until the MOT and it failed on emissions. I was told that the manifold leak and the studs broke. Machined and changed head gasket and the tiking noise has gone away. But the light is still on. However the engine at low and acelerated rev rate is very unstable and it sounds wrong. I am told that the lambda sensor may be the problem.
The car is X reg with 53k on the clock and I want to keep it but am concern that the problem is something else and I am keeping pouring money in the wrong places.
I have looked at previous posts and found lots of relevant topics but not sure on what to do next, if someone can help please let me know.

[tigers_gonads]

update your profile too show where you are 

[tunnie]

I have a vauxhall omega for nearly 5 years. Last few months the engine light came on and a tiking noise from the engine.
I left this until the MOT and it failed on emissions. I was told that the manifold leak and the studs broke. Machined and changed head gasket and the tiking noise has gone away. But the light is still on. However the engine at low and acelerated rev rate is very unstable and it sounds wrong. I am told that the lambda sensor may be the problem.
The car is X reg with 53k on the clock and I want to keep it but am concern that the problem is something else and I am keeping pouring money in the wrong places.
I have looked at previous posts and found lots of relevant topics but not sure on what to do next, if someone can help please let me know.

Hope you mean the exhaust manifold gasket, and not the cylinder head gaskets 

Also one crutial bit of info missing.... what engine!?

[amigdalo]

It was actually both at the end as to drill the studs I was told the head gasket had to come off. The engine is a 2.0l petrol with an automatic gearbox.

[treusi]

been having a problem for a while with EML. shows fuel trim bank problem. cleared fault each time. from cold could drive fine for half mile then EML would come on and a fut fut fut noise (almost a ticking sound) would appear. then it drove as if you were pulling a trailer - wanted to go but something holding it back. after much deduction it was a collapsed cat. after half a mile exhaust gasses couldnt escape and the back pressure was too much and started to make the fut fut noise thus causing the front lambda to over heat and turning the EML on, also, because it was laboured, causing the auto box to be confused and changing gear at stupid times for no reason and cruise only affective up to 50mph. my sollution - new cat, new lambda (£200 plus labour) and away we go - sorted. i knew there was a good car in there somewhere.