Engine Exhaust Temperature Sensor 1 Circuit High
Indicates that the Engine Exhaust Temperature (EET) sensor 1 is detecting a high voltage output.
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What it means (plain English)
The computer monitors the temperature of the exhaust gases to control emissions systems. If the sensor sends a voltage above the normal range, it could mean it’s faulty or there’s an issue in the circuit.
What the computer is actually seeing
The engine control unit (ECU) expects voltage between 0.5V to 2.5V from the sensor. A reading above 2.5V indicates a problem.
What a healthy reading looks like
Normal sensor output voltage is typically around 1.0V to 2.5V when operating correctly. Anything above 2.5V triggers this code.
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 temperature sensor wiring for obvious damage or corrosion.
- 2Verify the connector is seated properly and has no bent pins.
- 3Measure the voltage at the sensor with the key on, engine off. Expected should be between 0.5V and 2.5V.
- 4Start the engine and measure the voltage again. Confirm it does not exceed 2.5V under normal operating conditions.
- 5If voltage is high, replace the exhaust temperature sensor. If normal, inspect wiring for shorts to power or ground.
Common causes
- Faulty exhaust temperature sensor
- Open or short circuit in the sensor wiring
- Poor connections at the sensor or ECU
- Corrosion or damage in the exhaust system affecting the sensor
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code present?
It's generally safe but should be fixed soon to avoid potential emissions issues or further failures.
Will this code come back after clearing?
If the underlying issue isn't resolved, yes, the code will likely come back.
Why is this code paired with SPN 2676?
SPN 2676 typically indicates a related low voltage condition from the same sensor, helping to pinpoint sensor or circuit issues.
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