Exhaust Gas Temperature Sensor 1 Circuit High
The engine control module has detected a high voltage reading from the exhaust gas temperature sensor 1.
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What it means (plain English)
The exhaust gas temperature sensor detects how hot the exhaust gases are. A high voltage from this sensor (over 2.5 volts typically) means the sensor is likely faulty or there's a wiring issue causing it to read higher than it should.
What the computer is actually seeing
The ECM sees a voltage from the exhaust gas temperature sensor that exceeds the specified range, often above 2.5 volts indicating a potential fault.
What a healthy reading looks like
Normal operation should see sensor voltage between 0.5 and 2.5 volts depending on exhaust temperature. Above 2.5 volts indicates a problem.
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 corrosion. A visual inspection can save time.
- 2Test the voltage at the sensor connector with the engine running. You should see a voltage between 0.5 and 2.5 volts. If it's over 2.5 volts, replace the sensor.
- 3Inspect the connector for bent pins or corrosion. Clean or repair as needed and retest the voltage.
- 4If wiring and connector check out, replace the exhaust gas temperature sensor and clear the code.
Common causes
- Faulty Exhaust Gas Temperature Sensor
- Wiring issue or short circuit in the sensor circuit
- Connector corrosion or damage
- Exhaust leaks affecting sensor readings
Typical repair cost
$$$
Related codes
Frequently asked questions
Can I still drive the vehicle?
Yes, but drive it cautiously and have it checked soon as it might affect performance or emissions.
Will this code come back after clearing it?
If the underlying issue isn't fixed, the code will likely return.
What if the sensor looks fine but the code persists?
Focus on checking the wiring and connectors or possible exhaust leaks that could affect readings.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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