Exhaust Gas Temperature Sensor Circuit Intermittent (Bank 1 Sensor 2)
Common Symptoms
- Check Engine Light illuminated
- Increased diesel exhaust fluid consumption
- Reduced engine power or derate in some cases
- Poor fuel economy
- Intermittent exhaust system warning messages
Most Likely Root Causes
- Damaged or corroded exhaust gas temperature sensor wiring or connector
- Failing exhaust gas temperature sensor
- Intermittent connection at sensor harness due to heat cycling
- Exhaust leaks near the sensor causing thermal stress
- Corrosion on sensor terminals from moisture intrusion
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Component Location
The exhaust gas temperature sensor is located in the exhaust system downstream of the diesel particulate filter on Bank 1.
Manufacturer Notes
Diesel aftertreatment systems subject exhaust sensors to extreme heat cycles that can cause intermittent connector faults over time.
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