Exhaust Gas Temperature Sensor Circuit High (Bank 1 Sensor 2)
Common Symptoms
- Check Engine Light illuminated
- Reduced engine power or limp mode activation
- Increased exhaust system temperatures during regeneration
- DPF regeneration may not complete properly
- Poor fuel economy during active regeneration cycles
Most Likely Root Causes
- Exhaust gas temperature sensor failure or internal short
- Damaged or chafed wiring harness to EGT sensor
- Corroded or loose electrical connector at sensor
- ECM internal fault or sensor circuit issue
- Exhaust leaks near sensor mounting location
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Component Location
The Bank 1 Sensor 2 EGT sensor is typically located downstream of the diesel particulate filter or catalytic converter in the exhaust system.
Manufacturer Notes
Diesel engines with aftertreatment systems require accurate EGT monitoring for proper DPF regeneration and thermal management control.
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