Quote:
Originally Posted by ebbjak
So I pulled code P0133, nothing else. Based upon what I read, I replaced both pre cat O2 sensors and cleared the codes. About 30 miles later the CEL came back on. Again it was indicating P0133. I checked connections and reset the codes. Again, about 30 miles later the CEL came back on. Thoughts?
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Year and model of the car would be helpful.
You may now need to hook the car up to a Porsche specific scan tool like the Durametric system so that you can see the O2 sensor voltages in real time in order to find out what is going on.