Engine Exhaust Temperature Sensor 1 High
The exhaust gas temperature sensor 1 is reporting a high temperature.
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What it means (plain English)
Your engine's exhaust temperature sensor is detecting that the exhaust is getting too hot, which can cause issues with the emission system.
What the computer is actually seeing
The ECM monitors the exhaust temperature through a sensor that produces a voltage signal. If the temperature exceeds the expected range, typically above 900°F (482°C), a high voltage signal (over 4.5V) indicates a problem.
What a healthy reading looks like
Normal operation should yield a voltage signal between 0.5V (200°F, 93°C) and 4.5V (2000°F, 1093°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. Check the wiring and connectors for the exhaust temperature sensor for damage or corrosion. If found, repair/replace as needed. Decision point: Are the connections good? Yes - proceed to step 2; No - fix the wiring/connectors and retest.
- 22. Test the exhaust temperature sensor with a multimeter. Compare the readings to the expected values. Decision point: Is the sensor output within normal range? Yes - proceed to step 3; No - replace the sensor and retest.
- 33. Inspect for exhaust leaks around the sensor area. Repair any leaks found. Decision point: Are there leaks? Yes - fix the leaks and retest; No - check for other causes such as engine overheating.
Common causes
- Faulty exhaust temperature sensor
- Wiring or connector issues
- Exhaust leak
- Incorrectly installed turbocharger
- Overheating engine condition
Typical repair cost
$$
Related codes
Frequently asked questions
Can I still drive with this code?
You can drive, but it's best to fix it soon as high temperatures can damage components.
Will this code come back after clearing it?
It might, especially if the underlying issue isn't resolved.
Why might this code pair with others?
This code can indicate broader issues such as cooling problems or incorrect sensor readings.
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