Quote:
Originally Posted by andrewwynn
You can confirm worn cat by charting a graph with the same bank pre and post. The pre should flip high/low/high/low many times a minute. The post cat should work towards a valve and hover near a constant value. If it tracks lockstep with precat the cat is usually shot but If it's just a little too active you can add a defouler to get a couple more years out of a tired cat....snip
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IMO, when you have worn out sensors, trying to do 'rifle shot' diagnoses seems .... foolish. Maybe he gets lucky, but most of the published work on these oddball diagnoses and fixes tend to be done AFTER someone has installed proper O2s. At the least the pre-cat sensors. Massive $150 investment, I know....
JMHO