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theres no good test for this. but heres a few symtoms of a bad 02 sensor. engine will run real rough, engine pinging, bad fuel milage, and increased vehicle emissions. The defective oxygen sensor also shows up as a check engine light or malfunction indicator lamp illuminating in the vehicle's dash board.

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โˆ™ 2012-05-22 14:18:31
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Q: How do you test to see if the oxygen sensor needs to be replaced on a 2002 Pontiac Grand Am?
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