Rich-running engine due to oxygen sensor failure on Buick Skylark

The oxygen (O2) sensor may fail causing the engine to burn to much fuel and may cause the check engine (SES) light to illuminate.

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Average mileage: (–)
Exhaust & Emissions affected: 2.3L 4 Cylinder
4 model years affected: 1992, 1993, 1994, 1995
4 people reported this problem
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