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Author Topic: GTI fail MOT on emissions  (Read 4101 times)

Offline frampsgti

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GTI fail MOT on emissions
« on: 19 April 2012, 20:14 »
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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Offline frampsgti

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Re: GTI fail MOT on emissions
« Reply #1 on: 20 April 2012, 09:03 »
Has anyone got any other ideas other than the lambda sensors which im changhing today????
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Offline asboGTI

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Re: GTI fail MOT on emissions
« Reply #2 on: 20 April 2012, 09:10 »
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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Offline frampsgti

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Re: GTI fail MOT on emissions
« Reply #3 on: 20 April 2012, 09:17 »
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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Offline asboGTI

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Re: GTI fail MOT on emissions
« Reply #4 on: 20 April 2012, 09:31 »
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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vw golf mk4 ARZ 1.8T pipercross panel filter, xenon headlights, JOMS coilovers, forge 007p with green spring, audi tt anti roll bar, 3inch ebay trubo back exhaust, COOKIES MONSTER STICKER(adds bhp I swear)

Offline frampsgti

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Re: GTI fail MOT on emissions
« Reply #5 on: 20 April 2012, 10:30 »
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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Offline asboGTI

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Re: GTI fail MOT on emissions
« Reply #6 on: 20 April 2012, 11:05 »
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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vw golf mk4 ARZ 1.8T pipercross panel filter, xenon headlights, JOMS coilovers, forge 007p with green spring, audi tt anti roll bar, 3inch ebay trubo back exhaust, COOKIES MONSTER STICKER(adds bhp I swear)

Offline Wayne

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Re: GTI fail MOT on emissions
« Reply #7 on: 20 April 2012, 13:37 »
Failed lamba will normally throw up a fault code, I suspect you have a cat problem.
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Offline asboGTI

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Re: GTI fail MOT on emissions
« Reply #8 on: 20 April 2012, 13:41 »
Quote from: Wayne on 20 April 2012, 13:37
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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vw golf mk4 ARZ 1.8T pipercross panel filter, xenon headlights, JOMS coilovers, forge 007p with green spring, audi tt anti roll bar, 3inch ebay trubo back exhaust, COOKIES MONSTER STICKER(adds bhp I swear)

Offline Wayne

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Re: GTI fail MOT on emissions
« Reply #9 on: 20 April 2012, 13:49 »
Quote from: asboGTI on 20 April 2012, 13:41
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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