GMC Sonoma Problem Report

GMC Sonoma Check Engine Light Due to Oxygen Sensor Failure

(5 reports)

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

Just purchased this from someone and had it serviced--brakes, oil change, etc. After driving around for about an hour, the Service Enging Soon light comes on. It does not affect the car's running, but the miles per gallon seem extremely low. -
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