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Originally Posted by vath2001
Maybe. Have you tried resetting the CEL. Drive it and read it when / if the CEL comes back.
When the CEL comes on, is it always the same codes? Or do they change every time?
O2 sensors are about $150 each from Porsche. I've seen them for $25 each on E-Bay... but no idea of how good they are.
And you have 4 O2 sensors (before and after each Cat).
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I have had the codes read twice. Advance Auto read them as P0171, P0174 and turned off the CEL. Two days later it came back on so I had AutoZone read them. Same codes showed and they also turned off the CEL. After it came back on I cleaned the MAF with electrical contact cleaner and reinstalled, disconnecting the battery before removing it. The CEL light was off for a time because I had disconnected the battery, but came on again a couple days later. This time I replaced the MAF after disconnecting the battery. The light is now out, but the rough idle continues and I expect the light to come back on at any time.
Would I not get codes against the O2 sensors if they were bad?