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Old 11-04-2009, 03:33 PM   #1
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Default P0420 engine code need help

The service engine soon lite came on .Took it to auto zone they said it's a PO420 code. Just put catted xpipe on slp loud mouth at deans peformance about 500 miles ago. Car ran great till now what to do. Any help would be great thanks RON there is no tune or mil elminators or pulley .the car has a jlt cold air intake slp catted xpipe and borla stingers
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Old 11-04-2009, 04:47 PM   #2
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is there a tune or mil elminators? if you have the mil eliminators my guess is one is bad

P0420 DTC Code - Catalyst System Efficiency Below Threshold (Bank 1)
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Old 11-04-2009, 05:04 PM   #3
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Check the wiring for the O2 sensors near the exhaust pipes. On occasion they can get too close to the pipes and melt the insulation.
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