GolfGTIforum.co.uk
Model specific boards => Golf mk4 => Topic started by: frampsgti on 19 April 2012, 20:14
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Hi guys
Right put my golf through its MOT today and it failed on emissions!! In particular carbon monoxide reading was 7.000 and the lambda reading was way out both on idle and fast! It's been serviced prior to MOT! So I'm thinking it's the Lambda sensors!!! I've got no fault codes coming up!!
It's a 2.0 GTI on a V reg!!
Has anyone had a similar problem??
Could it be the CAT as well although I don't think it is!!!
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Has anyone got any other ideas other than the lambda sensors which im changhing today????
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change the sensor get an emissions test done again you should have a free retest. if its not then replace the cat if the lambda readings are way out then its mroe than likely the sensor but if its the cat can be expensive might be worth looking at a sports cat instead of a standard one and if you dont wanna do that get sort of legite MOT :grin: :laugh:
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im doing both the lambdas today so will see if that makes a difference then the CAT, the HC reading was out as well which is a little worring as that usually indicates piston rings!!
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well just wait and see lambda sensors play a major part unless there are mapped out i know someone who has tried to fix things and gone the wrong way about and turned out it was a sensor
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just changed the spark plugs and there not oily just burnt well so hoping that piston rings are ok. so fingers crossed its the lambdas
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good luck fella your going the right way about it hope you get you nice lovely green oh wait there not green any more they just white pieces of paper that you actually have to read weather it has passed or failed :laugh: :laugh: :laugh:
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Failed lamba will normally throw up a fault code, I suspect you have a cat problem.
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Failed lamba will normally throw up a fault code, I suspect you have a cat problem.
i thought only one of them did as some have 2 lambda sensors and the front one normally doesnt throw up the code only the one after the cat? am well confused now
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i thought only one of them did as some have 2 lambda sensors and the front one normally doesnt throw up the code only the one after the cat? am well confused now
My front one failed a few weeks back and was showing a code
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i thought only one of them did as some have 2 lambda sensors and the front one normally doesnt throw up the code only the one after the cat? am well confused now
My front one failed a few weeks back and was showing a code
well i aint got a clue then oh well still worth a try aint it cheaper than a cat
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well the two lambdas have made a massive difference as it past part of the test but still failed, so changing the CAT next. i think the CAT has had a beating and now its died. I checked both ends with a heat probe and the end furthest away from the end was cooler than the other end so its not heating up. I have a secondhand CAT to try. so fingers crossed.
Ive had no fault codes what so ever on my VAG scanner however on a readiness test it says CAT fail.
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Replaced the CAT and it passed with flying colours, the old CAT had nothing left inside so it was completely destroyed!!!