Exhaust Gas Temperature Sensor Circuit Intermittent Bank 1 Sensor 3
The exhaust gas temperature sensor 3 on bank 1 (often after the DPF) shows intermittent dropouts. Erratic readings disturb DPF regeneration logic.
Affected components
- Exhaust gas temperature sensor
- Egt wiring
Common causes
- High likelihood: Intermittent connector
- Medium likelihood: Chafed wiring near hot exhaust
- Low likelihood: Harness routed against vibrating component
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.