Exhaust Gas Temperature Sensor Circuit Intermittent (Bank 1 Sensor 1)
Common Symptoms
- Check engine light illuminated
- Reduced engine power or limp mode
- Poor fuel economy
- Increased exhaust emissions
- Rough idle or hesitation under load
- DPF regeneration issues or failure to regenerate
Most Likely Root Causes
- Damaged or corroded exhaust gas temperature sensor wiring harness
- Intermittent sensor connector contact due to heat cycling or vibration
- Failed exhaust gas temperature sensor
- Exhaust leaks near the sensor causing temperature fluctuations
- Corroded or loose sensor electrical connector pins
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Component Location
The Bank 1 Sensor 1 exhaust gas temperature sensor is located in the exhaust manifold or downpipe near the turbocharger outlet before the catalytic converter.
Manufacturer Notes
Diesel engines with aftertreatment systems often experience sensor harness failures due to extreme heat exposure near turbochargers and exhaust components.
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