Ever had a P0420 code (cat) appear and go away by itself?
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10-04-2012, 08:44 AM
05 LGT 5MT
What gas do you run? Any gas additives? Running too rich, or what is your gas mileage like compared to other PZEV's?
Killing two cats within 150,000 miles seems strange to me.
Although I see your ECM was reprogrammed, so hmmm.
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