Exhaust Gas Temperature Sensor Circuit Low (Bank 1 Sensor 3)
Common Symptoms
- Check Engine Light illuminated
- Reduced engine power or limp mode activation
- Poor fuel economy
- Increased exhaust emissions
- DPF regeneration issues or incomplete regens
- Engine derate on diesel applications
Most Likely Root Causes
- Faulty exhaust gas temperature sensor (Bank 1 Sensor 3)
- Damaged or corroded wiring harness to EGT sensor
- Open circuit or short to ground in sensor circuit
- Corroded sensor connector terminals
- Failed engine control module (rare)
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Component Location
Bank 1 Sensor 3 EGT sensor is typically located in the exhaust system downstream of the DPF or SCR catalyst, often near the tailpipe outlet.
Manufacturer Notes
Diesel engines with DPF and SCR systems use multiple EGT sensors for emissions system monitoring and regeneration control.
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