Exhaust Gas Temperature Sensor Circuit Intermittent (Bank 1 Sensor 3)
Common Symptoms
- Check engine light illuminated
- Reduced engine power or limp mode activation
- Increased exhaust emissions during testing
- Poor fuel economy
- DPF regeneration cycles more frequent than normal
- Rough engine operation under load
Most Likely Root Causes
- Damaged or corroded exhaust gas temperature sensor wiring harness
- Loose or intermittent electrical connector at EGT sensor
- Failed exhaust gas temperature sensor
- Exhaust leaks near sensor causing temperature fluctuations
- Moisture intrusion in sensor connector
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Component Location
EGT Sensor 3 Bank 1 is typically located downstream of the diesel particulate filter in the exhaust system.
Manufacturer Notes
Diesel engines with aftertreatment systems use multiple EGT sensors for DPF regeneration monitoring and this sensor is critical for post-DPF temperature tracking.
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