P1125 Code on 99 Boxster. Not sure if this means I need to replace one or two O2 sensors on Bank 1 and if so which one? pre-cat or post cat. But I wonder what else can be the issue. I dont have a combo codes of 1123 and 1125, just the 1125, and I just replaced the MAF to no avail anyway.



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This post was auto-generated based upon a question asked on our tech article page here: Porsche Boxster Oxygen Sensor Replacement - 986 / 987 (1997-08) - Pelican Parts Technical Article

That code is for a fuel trim fault, not a faulty o2 sensor. You will need to check when the vehicle is having a fuel trim issue, at idle or when driving. Then check which component is causing the issue. For example, vacuum leak or maf sensor.

- Nick