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#7: 02-06-2013, 09:39 AM
 
 mnstrmech
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actually, being an ASE technician for the last 10 years, a p0420 IS a dead cat, 99.99% of the time. If your downstream O2 sensor is bad, then you get a p0139 B1S2 O2 slow response code pops up.

Last edited by mnstrmech; 02-06-2013 at 08:26 PM..