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ChrisCo
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I was hoping someone with more knowledge can assist me in interpreting some OBD II codes. I have a 2001 Boxster S which I purchased about 60 days ago. The car appeared to be very well taken care of and the PPI only found minor wear and tear items which I had fixed within a couple weeks of purchase. The car was approaching 45,000 miles so I also had the 45K service completed a couple weeks ago. Last week while driving on my normal commute the CEL came on (steady burn). Since I had just had the 45K service completed at the dealership, I took it back to them and asked them to do a quick diagnostic. They came back with codes of P0133 & P1275 (Both of which I understand are the pre-cat O2 sensor on the bank 1). The dealership kept the car for the day and replaced the bank 1 pre-cat O2 sensor with a "scrap" sensor they had and the graph from the computer printout showed a similar wave pattern, to the one prior to installing the "scrap" sensor, with the delayed reading from the pre-cat sensor. The dealer's diagnosis was that the catalytic converter was bad on bank 1 (BTW is bank 1 the driver or passenger side on the 986?) and that it needed replaced. Since I do not have the funds to replace the catalytic converter at this time, I brought the car home and put it the garage to sit for awhile. Based on everything I have been able to research the diagnostic jump to a bad catalytic converter seems a bit extreme. I don't understand how the wave form from the pre-cat O2 sensor is driving a diagnosis of a bad catalytic converter. I would have thought the only way to say the catalytic converter was bad would be to have some reading off of the post-cat O2 sensor. Based on my interpretation of the wave form and current status of the car (i.e. no loss of power), I do not believe the catalytic converter is plugged (i.e. there seems to be no air flow restriction that I can detect). Am I off base here or should I continue to troubleshoot this beyond just replacing the catalytic converter? Any thoughts or ideas would be appreciated. Thanks Chris