Enhanced Exhaust Gas Temperature Sensor Circuit High
Indicates a high signal from the exhaust gas temperature sensor.
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What it means (plain English)
The exhaust gas temperature sensor is reading a voltage that's too high, which usually indicates a short circuit or a bad sensor.
What the computer is actually seeing
The engine control unit (ECU) sees a voltage signal from the exhaust gas temperature sensor that exceeds the expected range, typically above 4.5 volts.
What a healthy reading looks like
Normal operating voltage for the sensor should be between 0.5V and 4.5V depending on temperature; over 4.5V indicates a fault.
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 wiring for damage or shorts to ground.
- 2Inspect the sensor connector for corrosion or loose connections.
- 3Measure the voltage at the exhaust gas temperature sensor; it should be under 4.5V. If it's high, replace the sensor.
- 4If the sensor and wiring are good, check the engine control unit for faults.
Common causes
- Short circuit in the wiring harness
- Failed exhaust gas temperature sensor
- Poor connector integrity or corrosion
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It's best to fix this soon; running with high exhaust temperatures can damage the turbo or other components.
Will this code come back after clearing?
Yes, if the underlying issue isn't fixed, it will likely return.
Why does this code pair with other SPN codes?
Multiple codes can indicate related issues in the exhaust or emissions system.
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