Hi Guys,

My car failed its MOT this week and was looking for a bit of advice. It failed on a couple of things which I think I have sorted. The one failure I'm not too sure about is:
"Exhaust emissions lamba reading after 2nd fast idle outside specified limits (7.3.D.2"

The emissions print out for the fast idle reads something like this:
First test
CO =< 0.30% 0.01% PASS
HC =< 200 PPM 12 PPM PASS
¥ 0.97 - 1.03 1.042 FAIL

Second test
CO =< 0.30% 0.00% PASS
HO =< 200PPM 7PPM PASS
¥ 0.97 - 1.03 1.035 FAIL

Does anyone know what is causing this and any ideas of best way to fix it. Is it by any chance the lamba sensor itself?

P.S Please excuse the ¥ symbol I couldn't find the right one

I'd guess its the sensor. The emissions are ok but the reading from the lambda sensor is outside the allowed range (0.97-1.03).

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Pics of my 6
My 6 on Google Video thanks to coxy306Xsi

Thanks for the ideas guys. I have just had a look at the car and there is a slight leak from the manifold to the cat. So Im guessing this could be it.

I havnt got time to sort it now before it goes back in for the retest. Seeing as it is on the rich side of the reading would taking it out for a drive and getting it nice and hot before the test help at all. Guessing its going to be running slightly leaner once its hot?

Dont want to be paying the garage silly money to fix it especially as its only just out.

Adam

^ look who reappeared

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306 rallye reproduction decals (full sets/individual decals) | 306 b-pillar textured vinyl weatherstrips
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gti6 inlet manifold badges | 306 rear boot badges (p2/p3)
winner of Extraction of toys from prams with outstanding vigour award 2009 [source: gti6 owners club]