My 2yr 11month MR2 failed its MOT due to a Lambda reading outisde the set range. The reading was 1.22 @ 3000rpm, the range max is 1.90. The car is due for a service but Mr T could not fit me in for a MOT so I had to go another garage. The tester was very good, he shoewd me the equipment and tried the reading at different rpms. The engine was hot as I had just given the car a run. Any advice on what I should say to Mr T. The car is still under waranty, just!
If it's still under warranty then I'd get yourself down to Toyota and get them to sort it - save yourself the headache s;) ;) s;)
The fault could be a number of things (sort of in order of likelihood):
Failing/dirty MAF sensor
Leaking exhaust joint
Failing O2 sensor(s) (but not failing enough to throw a CEL)
Failing injector
Much easier for Toyota to do the diagnosing & fix it under warranty than to keep trying for an MOT, especially if the re-test isn't free..
I Agree with Aron get it to Toyota, if they log a fault, but can't fit you in at least them it will have been identified under warranty.
If you are just about to run out of Warranty, I'd seriously advise you to look at extending it, either with a Toyota, Full manufacturers one or with an independant one. £600 is a small price to pay for 2 years more trouble free motoring. (Or less with an independant one) you can find the discussion on pro's and con's or each else were.
The only thing is, I'm not sure if your re-test covers you for having it done at a different dealers ? so you may need to pay for the test at Toyota, or have the work done and return it to your previous.
but I think I paid about £25 for mine at Toyota, so no big shakes.
Cheers
Darren J
I would pretty much guarantee it's the MAF. Odds on that cleaning it will get you straight through.
FWIW, it could be a O2 sensor on its way out - the dealer should be able to check this via the OBD-II output easily.
The main cat sensor failed on mine just as I was taking it to get the turbo Conversion done (!)
One thing I've found though - the Generic £40 O2 sensors aren't as good as pukka MrT ones, even if the MrT parts cost £130.
I tried fitting a generic one to mine after the turbo conversion and I had problems with the call stalling when coming to a stop - refitted a known good pre-cat sensor and the problem went away.
Passed! They replaced, or so they tell me, under waranty pre and post cats and the engine ecu. All of this meens nothing to me but it fixed the problem.
smells fuishy to me
thats about £3K worth of parts, and they never bitched once!