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).

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Average mileage: 117,524 (49,000–185,432)
Exhaust & Emissions affected: 2.5L 4 Cylinder
7 model years affected: 1990, 1991, 1992, 1993, more2000, 2002, 2003
13 people reported this problem
5 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.
1990 Chevrolet S10141,500
truck start but runs high and low in idleing then stalls
2002 Chevrolet S10134,000
Sensor heater not working in 2 sensors
2003 Chevrolet S10103,767
After changing the downstream sensor twice in 3 weeks it has failed again. Entire exhaust is new. What gives?
Had to replace the down stream O2 sensor.
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