Question about 1998 Chevrolet Suburban
The subject code indicates catalyst efficiency below normal on the left bank. Catalytic converters replaced in the last year. The first time the code was differnet indicating the problem was on the right bank. I cleared the code and the left bank came up instead. Truck runs fine other wise.
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Posted on Jan 02, 2017
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Sep 29, 2015 | 2009 Chevrolet Lumina SS
Mar 09, 2013 | Cars & Trucks
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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