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P0430, oxygen sensor

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Couldn't find much searching so I thought I would throw out a question. I have a '00 C2 coupe tiptronic with 83k miles. About 1 month ago I got a P0430 CEL (catalyst below threshold). Autozone cleared it and it just came up again, both times this occured I had just filled up, gas cap is tight. I have reset the code a couple of times on this tank of gas but has come back. Talked to the dealer and they said that it is rarely the cat more likely an O2 sensor. For $120 they will do some checking, including running an ohm check on the O2 sensors. If it is the O2 sensor then I would have to pay their price for the part and $120/hr in labor. So I figure I could buy a scan tool and do this myself. I did some quick research and was considering the Auto-enginuity or Durametric. Talked to Auto-enginuity and theirs seemed to be a good deal until I found out that not all of the options are supported for Porsche (e.g. real time sensor data). So I bought the Durametric system based upon the input from this website. So my question to the group is, I will get this scanner and it will show me the P0430 but will it give me any details about the O2 sensor? Can it run the "ohm" check like the dealer so I can figure out which one it is, if that is the problem? Your input is appreciated.

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P0430 TWC Conversion, Bank 2 – Above Limit

Yes, the Durametirc software will show you more. More importantly it will show if you have other codes. Right now if P0430 is your only code then you have a bad catalytic converter (on that side).

If you read it with the Durametric software and it also show you an aging fault for the O2 sensor on that side then it may just be a worn out sensor.

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Thanks for the reply Loren. I had only one P code checked by a couple of different Autozones. I just filled up at a different gas station and magically the CEL is gone. The previous two times that the CEL came on for P0430 was when I had just filled up at the same (not the one today) gas station. However, I have also filled up there many times before. I guess they got some bad gas. Station is new so I wouldn't expect problems with the tank. I always use premium. Anyway, hopefully this saves me the cost of a catalytic converter.

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