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

6 Answers


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

3 of 3 people found this 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



Changed upper and lower 02 sensors check engine light still stays on

2 of 2 people found this helpful.

2006pt cruiser changed on sensors upper and bottom check engine light still stays on code p0038 lower sensor is new


1 of 1 people found this helpful.

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