I recently bought a 2008 Porsche Cayman S and had a PPI run on it and everything came back fine. I got it custom dyno tune, and then put on an aftermarket exhaust, an agency power and was going to go get retuned, and got a CEL. Read the codes and it said bad post cat in bank 2. I went ahead and replaced that 02 cleared the codes and the CEL came back on and said primary cat in bank 1 stuck open and running rich. I replaced the primary cat sensor in bank 1, and still have a CEL after clearing the codes, and it's still showing an issue with the Bank 1 02 stuck open and running rich.

Somebody told me that my tune file was corrupted, but I highly doubt that because if it was my car wouldn't be running right now.

If anybody has run into this issue or has experienced something similar any input would be great. Thanks.

 

Did you get it retuned after the install of the other parts? If not I'd start there, after maybe swapping a couple of sensors around to see if the fail follows the sensor or stays at the same location.

 

Seems to have been the tune. We put it back to stock right now and with the drop in filter and exhaust it is not throwing a CEL on the stock Porsche File map. We now have got the latest map file from Porsche and will tune off of that. I will let everybody know! Thanks for the help.

 

Had a feeling it was the tune but didn't want to bark up the wrong tree. Who is tuning it?

 

Frank Smith of Tech Tuning. Great tuner and well known!