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EBacon
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Super, thanks very much for the guidance! (Btw I didn't mean to imply I thought clearing the CEL fixed anything; we just thought to wait & see if it would recur or not.) Cheers, Liz
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Hi Loren, I've got an '06 Cayman S that's thrown the P0421 code for the second time. My mechanic friend just cleared it the first time, and now I'm wondering what to do. I've owned the car for six months, first issue with it. I've searched the forums here and seen a couple of your responses on this issue. Can you confirm that the P0421 code (i.e., NOT the P0431 code) means possible fault causes: - Catalytic converter faulty (pre-catalytic conversion rate too low) - Oxygen sensors in front of and behind catalytic converter swapped (position in exhaust assembly) Also, can you offer me some guidance about whether I should have my mechanic start with investigating/replacing the oxygen sensors (I tend to doubt their position is swapped or this issue would have been occurring before, right?) or just go ahead & replace the catalytic converter (since it seems that this is a known issue with the MY06 Cayman S)? Ideally the work would be under warranty as I'm good through Oct '10 thru Porsche plus I bought an extended warranty :). Cheers, Liz