Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Exhaust Gas Temperature (EGT) Sensor
The EGT sensor is a resistance temperature detector (RTD) type sensor. The EGT sensor is an input to the PCM and measures the temperature of the exhaust gas passing through the exhaust system. The electrical resistance of the sensor increases as the temperature increases, and resistance decreases as the temperature decreases. The varying resistance changes the voltage drop across the sensor terminals and provides electrical signals to the PCM corresponding to temperature.
For Transit, the PCM uses the input from 3 EGT sensors to monitor the exhaust gas temperature. The EGT bank 1, sensor 1 (EGT11) is located before the diesel particulate filter. The EGT bank 1, sensor 2 (EGT12) is located after the diesel particulate filter. The EGT bank 1, sensor 3 (EGT13) is located after the SCR catalyst.
For all others, the PCM uses the input from 4 EGT sensors to monitor the exhaust gas temperature. The EGT bank 1 sensor 1 (EGT11) is located before the OC. The EGT bank 1 sensor 2 (EGT12) is located after the OC. The EGT bank 1 sensor 3 (EGT13) is located after the SCR catalyst (F-Series Super Duty wide frame) or after the diesel particulate filter (F-650/F-750, F-Series Super Duty narrow frame). The EGT bank 1 sensor 4 (EGT14) is located after the diesel particulate filter (F-Series Super Duty wide frame) or after the SCR catalyst (F-650/F-750, F-Series Super Duty narrow frame).
Typical EGT Sensor
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.