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
RepairPal Verified
Average mileage: 124,466 (49,000–185,432)
Exhaust & Emissions affected: 2.5L 4 Cylinder
7 model years affected: 1990, 1991, 1992, 1993, more2000, 2002, 2003
19 people reported this problem
Viewing 1 - 6 of 6 comments
After changing the downstream sensor twice in 3 weeks it has failed again. Entire exhaust is new. What gives?
Check engine light on constantly. Level 1 diagnostic flagged Oxygen Sensor #1, Bank #1. Replacing sensor corrected problem.