MOT Fail, HELP! - CO idle too high - Lambda out?
Failed the MOT today, fast idle pass, natural idle, failed on CO, way way way above the acceptable tolerance, should be under 0.5%, reading was 2.64%.
I suspect the Lambda sensor needs replacing. Would appreciate it if you good peops could confirm for me. I'm doing an ECU diagnostic right now...... Car is a UK Turbo MY99 Cheers. |
No ECU faults. As the exhaust is standard and it's running both cats I'm putting my money on the Lambda, going to pick up a Bosch LS02 now.....
.....anybody have any idea which wire goes where in the plug? |
The smart money would go on the Lambda, particularly if you've got both cats on still.
Faulty Lambda's tendy to result in quite a lumpy feeling drive part throttle around the 3,000 rpm mark. It's been a while since I've changed one, but IIRC it was relatively obvious which wire goes where. On a 3 wire sensor 2 wires are the heater and normally the same colour as it doesn't matter which way it goes round and the 3rd is the sensor wire itself. If you have a 4 wire sensor (the scoobs use 3 wire as standard) the the 4th wire is the ground. |
Nice one, tis a 3 wire and have picked up a Bosch part. I have experienced a very slight lumpiness under light throttle low in the rev range so looks like this ties up, I guess that if the CATs were stuffed then the fast idle would fail also. Also I suppose that the ECU wouldn't pick it up (yet) if the Lambda sensor is still cycling, albeit slowly, and is on it's way out.
Ta for the advice. |
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