Exhaust Gas Temperature Sensor Circuit Intermittent (Bank 1 Sensor 1)
The EGT sensor at bank 1 sensor 1 signal jumps or drops out intermittently — typically a connector or chafed wire near the exhaust manifold heat zone.
Affected components
- Exhaust gas temperature sensor
- Egt harness
Common causes
- High likelihood: Connector loose or oxidised
- Medium likelihood: Wire chafed against exhaust shielding
- Low likelihood: Connector with intermittent contact under vibration
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Related codes
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.