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Old 01-20-2009, 06:37 PM   #1
Black Denali
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Default PO 420 and PO 430


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Well these are the codes I got on my truck. I looked them up and it said...
DTC PO420 catalyst system low efficiency bank 1 and bank 2. Any suggestions guys? I hope it's just the O2's and not the whole system.
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Old 01-20-2009, 09:19 PM   #2
HaKs310
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can also be that you might have an exhaust leak in-front of the cats. I would check this first..then the oxygen sensors..then the cats.
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Old 01-21-2009, 11:37 AM   #3
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Thanks I'll check that out.
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