Exhaust Gas Temperature Sensor 1 Fault
The exhaust gas temperature for sensor 1 is out of range.
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What it means (plain English)
The exhaust gas temperature sensor is reading a temperature that’s either too high or too low, which can indicate a problem in the exhaust system.
What the computer is actually seeing
The ECM is receiving a voltage signal from the exhaust gas temperature sensor that falls outside the standard operating range, generally between 0.5V (0°C) to 4.5V (1000°C).
What a healthy reading looks like
Normal operation for EGT sensors should be between 0.5V to 4.5V, ideally around 1.5V-2.5V for typical exhaust temperatures (200°C-600°C).
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Inspect the wiring and connector for the exhaust gas temperature sensor. Look for frayed wires or poor connections. Is the wiring in good condition?
- 22. Measure the voltage at the sensor connector with the key on and the engine off. Is the voltage within expected parameters (0.5-4.5V)?
- 33. If the voltage is out of spec, check the sensor’s ground. Is the ground solid and intact?
- 44. If the ground is good and voltage is still out of range, replace the temperature sensor. Did the code clear?
- 55. If the voltage is good but the code persists, replace the ECM. Did the code clear?
Common causes
- Defective exhaust gas temperature sensor
- Wiring issues (shorts, opens, corroded connections)
- Exhaust leaks affecting temperature readings
- Faulty Engine Control Module (ECM)
- Bad ground connection for the sensor
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It’s not recommended to drive long distances as this can affect emissions and performance.
Will this code come back after clearing?
If the underlying issue isn't fixed, the code will likely return.
Why do I see this code with other related codes?
Often, multiple sensors can fail due to the same electrical issues or related operational problems in the system.
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