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My CEL pop up on my Cayenne.  I then ran the Durametric and it found 3 codes and not quite sure where to start can anyone help me with this?

1)  P0056:

      HO2S heater control circuit bank 2 sensor 2 no signal/communication


2)  P0421

       Invalid data received from suspension control module.  Upper limit value exceeded


3)  P1248

      Basic boost pressure adaption.  Upper limit value exceeded

Edited by pcstitanium2006
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P0421 means the bank 1 O2 sensor is reading above the limit. That combined with the bank 2 sounds like you have a vacuum leak that's post MAF. And with a leak it is possible that it'll throw the boost code as well. I'd say check your pcv hoses and intake hoses, since they're plastic and with all the heat they have been known to crack. Also check the turbo hoses that are on top of the Y-intake. I usually have the engine running as I spray a little bit of carb cleaner or starting fluid across the hoses and see if the rpm increases.

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