Exhaust Gas Temperature Sensor Circuit High (Bank 1 Sensor 3)
Common Symptoms
- Check Engine Light illuminated
- Poor fuel economy
- Reduced engine performance or power loss
- Diesel particulate filter regeneration issues
- Increased exhaust smoke during regeneration
- Transmission may limit gear selection in some models
Most Likely Root Causes
- Faulty exhaust gas temperature sensor
- Damaged or corroded sensor wiring harness
- Exhaust leaks near the sensor location
- Poor electrical connection at sensor connector
- Water or corrosion intrusion in sensor connector
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Component Location
The Bank 1 Sensor 3 EGT sensor is typically located in the exhaust system after the diesel particulate filter or near the outlet of the aftertreatment system.
Manufacturer Notes
Many diesel engines use multiple EGT sensors to monitor aftertreatment system temperatures and control DPF regeneration cycles.
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