Question about Chevrolet Express
If a good tune up has not been performed then start there then do a cat burn off procedure where you short one cylinder and run engine @ 2500 rpm for 10 minutes this allows the cat converter to be super heated and burn off any contaminates once done the car will have to be hooked to scanner to turn out light
Posted on Sep 11, 2010
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Posted on Jan 02, 2017
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Dec 13, 2011 | 1999 Mercury Cougar
hi,my friend, you can try,
Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.
Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
Inspect the downstream heated oxygen sensor (HO2), replace if necessary
Replace the catalytic converter
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