Exhaust Gas Temperature Sensor 1 - High
The exhaust gas temperature sensor is reading a higher than expected temperature.
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What it means (plain English)
The exhaust gas temperature sensor measures how hot the gases are coming out of the engine. If it senses a temperature that’s too high, it could be because there’s a problem with the engine or even the sensor itself.
What the computer is actually seeing
The engine control module (ECM) sees a volt signal from the temperature sensor. For a properly functioning sensor, this signal usually ranges from 0.5 to 4.5 volts depending on the temperature. If the signal exceeds the normal range (above 4.5 volts), it triggers this code.
What a healthy reading looks like
The exhaust gas temperature should typically be between 300°F to 1400°F (150°C to 760°C) in various 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.
- 11. Inspect the wiring and connectors to the exhaust gas temperature sensor for any signs of damage or corrosion. If found, repair or replace the damaged parts.
- 22. Check the resistance of the exhaust gas temperature sensor using a multimeter. Compare the reading to the manufacturer's specifications for that specific sensor.
- 33. Verify exhaust gas temperatures with a scanning tool or exhaust thermometer to ensure that the readings match what the sensor is reporting.
- 44. Inspect the exhaust system for any leaks that may be causing erroneous temperature readings. Repair as necessary.
- 55. If all checks are normal, consider replacing the exhaust gas temperature sensor.
Common causes
- Faulty exhaust gas temperature sensor
- Wiring issues or connector problems
- Exhaust leaks
- Overheating of the engine
- Malfunctioning turbocharger
Typical repair cost
$$-$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It’s not ideal; you should fix it soon to avoid further engine damage.
Will this code come back after clearing it?
It may come back if the underlying issue isn't resolved.
Why does this code pair with SPN 2522?
SPN 2522 indicates a low temperature reading, which can occur if the sensor is faulty.
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