2004 Chevy Impala Location and Number of O2 Sensors

Tiny
MRSTONE2007
  • 2004 CHEVROLET IMPALA

Engine problem
2004 Chevy Impala 6 cyl Two Wheel Drive Automatic 65000 miles

My Impala has been pulling an OBD code for the Bank 1 Sensor 1 oxygen sensor, but I can not 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 2? If there are only 2, why would the same code continue to flash if the 2 sensors were replaced? Please help.

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

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Tiny
DENNYP
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The one before the converter is the correct sensor. Just because you have an O2 sensor code, doesn't 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
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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 can not find.

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

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