Exhaust Gas Temperature Sensor Circuit Low (Bank 1 Sensor 2)
Common Symptoms
- Check engine light illuminated
- Reduced engine power or limp mode activation
- Poor fuel economy
- Increased exhaust emissions
- DPF regeneration issues or failures
- Engine may run normally with no drivability concerns
Most Likely Root Causes
- Faulty exhaust gas temperature sensor
- Damaged or corroded wiring harness to EGT sensor
- Shorted sensor circuit to ground
- Corroded or loose connector at EGT sensor
- Failed engine control module
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Component Location
The Bank 1 Sensor 2 EGT sensor is located in the exhaust system downstream of the catalytic converter or diesel particulate filter.
Manufacturer Notes
Diesel engines with DPF systems rely heavily on accurate EGT readings for regeneration control and aftertreatment protection.
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