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

209,855

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

2 out of 2 people think this is helpful.
56,575

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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