Check Engine Light Due to Oxygen Sensor Failure on Chevrolet S10

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

RepairPal Verified
Average mileage: 131,238 (88,500–185,432)
Exhaust & Emissions affected: 2.5L 4 Cylinder
6 model years affected: 1990, 1991, 1992, 1993, more2002, 2003
11 people reported this problem
4 people shared problem details
2003 Chevrolet S1088,500
Check engine light on constantly. Level 1 diagnostic flagged Oxygen Sensor #1, Bank #1. Replacing sensor corrected problem.
2002 Chevrolet S10134,000
Sensor heater not working in 2 sensors
Had to replace the down stream O2 sensor.
1990 Chevrolet S10141,500
truck start but runs high and low in idleing then stalls
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