Question about 1998 Chevrolet Blazer
Using oil. no leaks, no smoking, pcv doesn't appear to be sticking. had a O2 sensor/catalytic converter message a few weeks ago. Change the upstream and the down stream O2 sensors and the check engine light cleared.
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Apr 14, 2013 | 1997 Mercury Cougar XR7
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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