Exhaust Gas Temperature Sensor 1 Circuit High
The exhaust gas temperature sensor is reading a voltage that is too high for a specified range.
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What it means (plain English)
The exhaust gas temperature sensor is supposed to measure how hot the exhaust is, typically between 200°F to 1,500°F. If the sensor wires are shorted or the sensor is broken, it might send a voltage signal that's way too high, which means there's a problem with the sensor or its wiring.
What the computer is actually seeing
The ECM sees a voltage from the exhaust gas temperature sensor that exceeds 4.5 volts, indicating a potential fault in the circuit or the sensor itself.
What a healthy reading looks like
Normal operation should see sensor voltages varying between 0.5 to 4.5 volts, depending on exhaust temperature.
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 wiring and connectors between the exhaust gas temperature sensor and the ECM for damage, corrosion, or loose connections. Decision: If there are visible issues, repair them; if not, continue.
- 2Measure the voltage at the exhaust gas temperature sensor connector with the ignition on. You should see between 0.5V and 4.5V. Decision: If voltage is too high (over 4.5V), the sensor or wiring is likely faulty; if voltage is normal, check for short circuits.
- 3Disconnect the exhaust gas temperature sensor and check the resistance of the sensor itself. It should be within the manufacturer's specifications (usually around 0.5 to 5 ohms). Decision: If the sensor is out of spec, replace it; if within spec, there may be a wiring issue.
Common causes
- Faulty exhaust gas temperature sensor
- Short circuit in wiring
- Open circuit in wiring
- Corroded or damaged connector
- Water intrusion in the sensor or connector
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally safe to drive, but monitor for performance issues. Address it when convenient.
Will this code come back after clearing?
If the underlying issue isn't fixed, the code will likely return after clearing.
Why does this code appear with other codes?
Multiple sensor issues can cause the ECM to throw multiple codes, especially if they're related to the emissions system.
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