Exhaust Gas Temperature Sensor 1 Circuit High
Exhaust gas temperature sensor circuit voltage is too high.
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What it means (plain English)
The exhaust gas temperature sensor measures how hot the exhaust gases are. If the voltage from the sensor is too high, it means there's probably a wiring issue or the sensor itself is malfunctioning.
What the computer is actually seeing
The engine control module (ECM) sees a voltage signal from the exhaust gas temperature sensor that exceeds the expected range, typically over 4.2 volts.
What a healthy reading looks like
The expected voltage range for a properly functioning exhaust gas temperature sensor is usually between 0.5 to 4.0 volts 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.
- 11. Visually inspect the wiring and connectors related to the exhaust gas temperature sensor for damage or corrosion.
- 22. Use a multimeter to measure the voltage at the sensor connector. You should see between 0.5 to 4.0 volts. If it's above 4.2 volts, there’s a problem.
- 33. If the voltage is high, check for shorts to power or ground in the wiring. Repair any issues found.
- 44. If wiring is good, replace the exhaust gas temperature sensor and see if the code returns.
Common causes
- Shorted wiring or connectors in the exhaust gas temperature sensor circuit.
- Faulty exhaust gas temperature sensor itself.
- Poor grounding or a bad connection in the sensor circuit.
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
You can drive the vehicle, but it's best to get this checked soon as high exhaust temperatures can lead to greater issues.
Will this code come back after clearing it?
Yes, if the underlying issue is not fixed, the code is likely to return after a drive cycle.
Why is this code paired with other codes?
Often, multiple exhaust-related codes will trigger if there's a common issue like wiring or sensor faults.
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