Thread: Ever had a P0420 code (cat) appear and go away by itself?
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#11: 10-04-2012, 07:44 AM
 
 slowGT
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Location: Mass
Car: 05 LGT 5MT
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I agree.

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.