Check Engine Light Due to Oxygen Sensor Failure on Pontiac Grand Prix

The oxygen sensor can fail causing Check Engine Light illumination and the engine to run rich (burn more fuel than normal).

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Average mileage: 134,333 (85,000–179,000)
Exhaust & Emissions affected: 2.3L 4 Cylinder
5 model years affected: 1990, 1991, 1992, 2004, more2005
7 people reported this problem
1 person shared problem details
02 sensor replaced and check engine light still on
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