08 GXP Engin Light - Pontiac G6 Forum
 
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post #1 of 8 (permalink) Old 10-18-2011, 07:33 PM Thread Starter
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08 GXP Engin Light

getting some ideas...The engin light comes on runs great had it read replaced gas cap took out the mass air flow and cleand it, take the neg. battery end off for 30 min. put back on. light off for 100 miles and comes back on....any ideas.
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post #2 of 8 (permalink) Old 10-19-2011, 10:14 AM
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Have it scanned figure out what the code is. You can't just throw parts at it.

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post #3 of 8 (permalink) Old 11-01-2011, 06:49 PM Thread Starter
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took to the zone they said it was a 420 code
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post #4 of 8 (permalink) Old 11-02-2011, 08:09 AM
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post #5 of 8 (permalink) Old 11-03-2011, 09:49 AM
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P0420 Catalyst System Efficiency Below Threshold (Bank 1)

http://www.obd-codes.com/p0420

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post #6 of 8 (permalink) Old 11-03-2011, 09:55 AM
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Switch the two O2 sensors see if the code moves to bank 2 if so its just an O2 sensor.
I had a P0430 code for a while and I had to get a new cat, but it solved the problem. If it comes to that it will be covered under warranty as long as your under 80,000 miles

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Last edited by waterfowler76; 11-03-2011 at 09:57 AM.
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post #7 of 8 (permalink) Old 11-05-2011, 05:19 PM Thread Starter
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had it read and it said
P0420 Catalyst System Efficiency Below Threshold
also said that the 02 sensors were ok
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post #8 of 8 (permalink) Old 11-16-2011, 07:09 PM Thread Starter
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took to the dealer turns out the cat. is bad, dealer cost, thanks for all the help
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