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Old 08-05-2011, 01:26 AM   Thread Starter #1
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Default Another PO420 Code Is Shown

I see some members are having SES light on with the PO420 being the culprit. A general fix is replacing the 02 sensors for both banks, even though the reference indicates it might not fix the issue!

Mine just popped up (coding PO420), car still running smooth (dunno for how long). Damn!!!! I had just replaced bad coil packs!

I'm still running factory precats and cat. I dread the thought of replacing these, especially when I gotta get emission done here by next week.

ANY SUGGESTION??
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Old 08-05-2011, 10:01 AM   #2
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Default Re: Another PO420 Code Is Shown

I've never had this happen.

FYI - http://my6thgen.org/showthread.php?t=4838
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Old 08-05-2011, 10:54 AM   #3
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Default Re: Another PO420 Code Is Shown

I have the same code, i'm not replacing the catts, i'm getting headers
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