Exhaust Gas Temperature Sensor Circuit Range/Performance (Bank 1 Sensor 1)
Common Symptoms
- Check engine light illuminated
- Reduced engine power or derate condition
- Poor fuel economy
- DPF regeneration cycles more frequently than normal
- Exhaust system temperature gauge reading abnormally high or low
Most Likely Root Causes
- Failed or degraded exhaust gas temperature sensor
- Damaged or corroded sensor wiring harness
- Exhaust leaks near the sensor location
- Carbon buildup on sensor tip affecting response time
- Poor electrical connection at sensor connector
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Component Location
The exhaust gas temperature sensor is mounted in the exhaust manifold or exhaust pipe upstream of the turbocharger or catalytic converter on Bank 1.
Manufacturer Notes
Diesel engines with DPF systems rely heavily on accurate exhaust temperature data for regeneration control and aftertreatment protection strategies.
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