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O2 Sensor specs

  • 2000
  • Boxster S
40 145

I have a 2000 Boxster S with a Ruf conversion to a 3.4 996 engine. My mechanic and I have been trying to sort out a check engine light for a while now. I have had fault codes P0420 & P0430. The P0420 has occured several times, been cleared, and has come back within about 100 miles of driving, each time. They have looked at the O2 sensors and did replace 1 in May at 38,785 miles as it seemed to be out of operating spec. Because of the conversion, there is some confusion on what parts and peices I have and what should be replaced. They ordered an O2 sensor for a 3.4, but apparently the plug was not compatable. The plug in the car is for a Boxster, so they put in a Boxster O2 sensor. I am not sure if it was a pre or post cat O2, bank 1 or 2. I believe I have a 996 ECU, but can not confirm. The most recent check last month, had a P1276 as well as a P430 & P0102 faults. Codes were cleared and a vacume leak repaired. Check engine light came back on after 200 miles. So, is it O2 sensor / sensors or catalytic converter? I know, tough question. I was able to get a part # from a Ruf contact and they suggest #99360612801 (996 before cat sensor). The car has just over 40,000 miles now, but this has been going on for a few thousand miles. One of our questions is if there is any difference in the O2 sensor's between a 996 part and a Boxster part that might contribute to this problem? I believe all 4 sensors were replaced in November of 2012 at 33,485 miles with Boxster sensors. I also have a receipt from the previous owner that the catalyst elements were replaced in 2005 @ 22,769 miles. I have done quite a bit of research about fault codes, O2 sensors and catalytic converters, but the more I read, the more confused I get. Your thoughts? Thank you

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