how do I know which O2 sensor is bad? my check engine light was on and I had a friend plug in a diagnostic tool which said bad O2 sensor but doesn't state which one
What was the code? Could be another issue causing the o2 to detect a problem.
Upstream is before the catalytic converter and downstream is after the catalytic converter. As Tom said please post the code so we can help further. -Jim
Changed upper and lower 02 sensors check engine light still stays on
2006pt cruiser changed on sensors upper and bottom check engine light still stays on code p0038 lower sensor is new
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