Check Engine Light Due to Oxygen Sensor Failure on Chevrolet S10

Problem Description and Possible Solution

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

Problem Data
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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
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Viewing 1 - 5 of 5 comments
truck start but runs high and low in idleing then stalls
Check engine light on constantly. Level 1 diagnostic flagged Oxygen Sensor #1, Bank #1. Replacing sensor corrected problem.
After changing the downstream sensor twice in 3 weeks it has failed again. Entire exhaust is new. What gives?
Sensor heater not working in 2 sensors
Had to replace the down stream O2 sensor.