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


Asked by Feb 22, 2014 at 12:33 PM about the 2001 Chrysler PT Cruiser Base

Question type: Maintenance & Repair

2 Answers

Tom Demyan

What was the code? Could be another issue causing the o2 to detect a problem.

2 out of 2 people think this is helpful.

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

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