P1139 — Chevrolet — HO2S Insufficient Switching Bank 1 Sensor 2

P1139 (Chevrolet): HO2S Insufficient Switching Bank 1 Sensor 2 — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

HO2S Insufficient Switching Bank 1 Sensor 2. Source catalogue definition; confirm applicability using vehicle service information.

Affected system: Powertrain