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'08 V6 threw 2 codes: P0431 and P0421

sws1
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sws1 Member

sws1

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Posted

My V6 was in shop last week with CEL on. Showed 2 codes: P0431 and P0421. The light went out on way to dealer. Dealer said it was strange that both codes were thrown. Reset computer.

Had to go to dealer again today. Same 2 codes were thrown again, triggering CEL.

As these are Catalytic converter / O2 sensor related, it seems bizarre that both codes would be thrown since they are the same code but from different banks.

Dealer has sent request to Porsche HQ to find out what's happening.

Any idea what this means?

sws1 Member

sws1

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This would indicate an O2 sensor is not reading/operating correctly - or you have an exhaust leak.

Thanks Loren. Why would I get both sides at the same time? Seems strange I have both o2 sensors, or exhausts failing at same time.

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