Exhaust Gas Temperature Sensor 1
The exhaust gas temperature sensor is out of range.
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What it means (plain English)
The exhaust gas temperature sensor measures how hot the exhaust gases are. If it's reading too high or too low, the computer thinks there's a problem and turns on the warning light.
What the computer is actually seeing
The engine control module (ECM) expects to see a voltage signal from the exhaust gas temperature sensor that corresponds to a specific temperature range (usually between 100°C to 900°C).
What a healthy reading looks like
Sensor voltage should be within 0.5V to 2.5V; temperature readings should be between 100°C to 900°C, ideally under normal operating conditions.
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.
- 1Check the exhaust gas temperature sensor for visible damage or corrosion. If damaged, replace the sensor.
- 2Inspect wiring and connectors for signs of wear or breaks. Repair as necessary.
- 3Using a multimeter, check the sensor voltage while the engine is running. Confirm it should be within 0.5V to 2.5V. If not, replace the sensor.
- 4If voltage is normal, check for exhaust leaks. Use a smoke test if needed, and repair any leaks found.
Common causes
- Faulty exhaust gas temperature sensor
- Wiring issues or bad connectors
- Exhaust leaks affecting temperature readings
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It's generally safe to drive but fix soon to avoid potential damage to the emissions system.
Will the code come back after reset?
If the underlying issue isn't fixed, yes, it will likely return.
Why does this code pair with others like SPN 3251?
These codes often indicate related problems with the exhaust system components.
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