Exhaust Gas Temperature Sensor Circuit (Bank 1 Sensor 1)
Common Symptoms
- Check engine light illuminated
- Poor fuel economy
- Reduced engine performance or power
- Excessive black smoke from exhaust
- Engine may enter limp mode
- DPF regeneration issues on diesel engines
Most Likely Root Causes
- Faulty exhaust gas temperature sensor
- Damaged or corroded wiring harness to EGT sensor
- Loose or corroded electrical connector at sensor
- Exhaust leaks near sensor location
- Failed ECM or PCM
Full step-by-step tests, DVOM guidance, and pinout data are available inside the AI Diesel Tech diagnostic session.
AI walks you through every test — one step at a time. Plans start at $12.95/mo.
Component Location
The exhaust gas temperature sensor for Bank 1 Sensor 1 is typically located in the exhaust manifold or directly after the turbocharger outlet.
Manufacturer Notes
Diesel engines with DPF or SCR systems rely heavily on accurate EGT readings for proper regeneration and emissions control functions.
Also diagnosing J1939 SPN/FMI codes?
Heavy-duty trucks often throw both OBD-II and J1939 faults simultaneously. AI Diesel Tech handles both protocols in a single guided session.
AI Diesel Tech — The Technician's Diagnostic Engine
AI Diesel Tech diagnostic logic is built by an ASE Certified Diesel Technician. Professional-grade OBD-II and J1939 fault analysis — trusted by technicians nationwide, used in shops, fleets, and training programs.
Get AI-Guided Diagnosis for P0544
The diagnostic engine walks you through every physical test — step by step, on your phone, at the truck.