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MOT emissions = Fail


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My car was mot'd on saturday and the emissions test read something like 10.7 on fast idle and it has to be under 0.3, i put my cat on but it had the sensors (o2 and lamba) off another car i stripped for parts.

I have a safc and a fpr but surely this wont cause my car to fail the emissions as when it was tuned it will have had to be tuned to the correct afr? (this had a differrent lamba in the de cat pipe) So im thinking more likely it is a faulty lamba sensor? any other views would be more than welcome :p

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Cheers its a safc II so it will loose all its settings then so it looks like i will probably have to take it back to he tuner's as i dont want to loose £160 worth of mapping. But surely the fuel map must be way out if its meant to be under 0.3 and its read at 10.7?

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Cheers guys well the tuner specifically remembers mapping leaner as the fpr was putting too much fuel in. So im going to change the lamba see if its faulty which it could be then if not im going to take it up to him so he can have a look. Thanks gentlemen for the great help :p

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The GT and Glanzas do NOT need a cat and unless youre running seriously stupid fuelling, it will pass with out a problem.

It will come under something like the standard idle emissions test , which is what they run on things like kit cars etc.

I hate mot testers who fail these cars on emissions with a passion, kick him in the gonads and squat on his face!

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