Location and number of O2 sensors

Tiny
MRSTONE2007
  • 2004 CHEVROLET IMPALA

Six cylinder two wheel drive automatic 65,000 miles.

My car has been pulling an OBD code for the Bank 1 Sensor 1 oxygen sensor, but I cannot find it. I can only seem to find one before the catalytic converter and one after, so am I overlooking one or are there only two? If there are only two, why would the same code continue to flash if the two sensors were replaced? Please help.

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Thursday, February 7th, 2008 AT 8:15 PM

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Tiny
DENNYP
  • EXPERT
  • 1,861 POSTS

The one before the converter is the correct sensor. Just because you have an O2 sensor code, does not mean a bad O2 sensor. You could have a bad converter or a fuel mixture problem. Can you post the code number for me please?

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Wednesday, February 13th, 2008 AT 10:34 AM
Tiny
MRSTONE2007
  • MEMBER

The code it is pulling is P0135. I have replaced the one before the catalytic converter, but the problem persisted which led me to believe there is another one I cannot find.

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Tuesday, February 26th, 2008 AT 5:19 PM

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