Could anyone help me to diagnose the above, it's failed on both low and high idle test with the following numbers:
Low idle:
CO 0.79% Vol (above 0.30% fail)
HC 240ppm
High idle:
Lambda: 1.02 (pass, between 0.97 and 1.03)
CO 0.80% vol (above 0.20% fail)
HC 238ppm (above 200ppm, fail)
The choke warning light has perpetually been on on this car (or is it the Lambda sensor light?) Car had a new catalytic converter fitted about 6 years ago. Mileage is currently at 186k miles.
There are no untoward sounds coming out of the exhaust, so I don't think the exhaust is leaking. Could this be a simple fix like a bottle of Dipetane, or else a new Catalytic converter?
any help appreciated, thanks
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