[b][user=2211]treemite[/user] wrote: [/b][quote]Hi everyone, this is my first post on this forum.
Yesterday I took my 1996 TOYOTA MR2 in for MOT and it failed on “Exhaust emissions Lambda reading after 2nd fast idle outside specified limits”.
The guy who did the MOT told me I had a minor leak at the catalyst joint and the guy at a different garage this morning told me I should get a new lambda sensor.
The readings were as follows –
[b]Fast Idle test[/b]:
CO 0.38% (vs 0.3% limit)
HC 59ppm (vs 200ppm limit)
Lambda 1.13 (vs 0.97 to 1.03)
[b]2nd Fast idle test [/b]
CO 0.11% (vs 0.3% limit)
HC 21ppm (vs 200ppm limit)
Lambda 1.16 (vs 0.97 to 1.03)
[b]Natural idle test [/b]
CO 0.35% (vs 0.5% limit)
The question is – do I get the leak repaired (changing of gasket I think) or get a new Lambda sensor?
The new Lambda sensor is a bit pricey for me at the minute (quoted at £120 fitted) so I was hoping that fixing the leak would solve the emissions problem. Is this likely?
Any advice gratefully received![/quote]
I agree with KevG on this one, more times than not fixing the exhaust leak cures the problem. With regards the lambda sensor, my view is to never change a part until the old unit has been tested, if the leak is before the lambda it will most certainly cause a rich mixture, which I can see you haven’t got, so the leak must be after the lambda fooling the gas analyser, fix the leak, test the lambda sensor and then take it back for a retest.
David:D
