Exhaust Gas Temperature Sensor 1 - Circuit High
The exhaust gas temperature sensor is reading a high voltage or open circuit condition.
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What it means (plain English)
Inside the exhaust system, this sensor measures how hot the exhaust gases are. If it's sending a signal that's too high (over 5 volts), the computer thinks something’s wrong, and it flags an error.
What the computer is actually seeing
The engine control unit (ECU) detects a voltage from the EGT sensor that exceeds its normal operating range, indicating an issue with the sensor or its circuit.
What a healthy reading looks like
EGT sensors typically operate between 0.5 to 4.5 volts at normal temperatures. Over 4.5 volts signals 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.
- 11. Inspect the wiring and connectors related to the exhaust gas temperature sensor for any signs of wear, damage, or corrosion. Repair any issues found.
- 22. Check the voltage at the connector with the ignition on (engine off). A good sensor output should be between 0.5 and 4.5 volts. If the voltage is above 4.5 volts, proceed to the next step.
- 33. Disconnect the exhaust gas temperature sensor and check the resistance. It should be within manufacturer specifications. If open or shorted, replace the sensor.
- 44. If the sensor tests good, perform a continuity test on the wiring harness back to the ECU. Repair any breaks or shorts found in the wiring.
- 55. Clear the fault code and take the vehicle for a test drive to see if the code returns.
Common causes
- Wiring issue or short to power in the sensor circuit
- Faulty exhaust gas temperature sensor
- Connector corrosion or damage
- Exhaust leaks affecting sensor operation
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best to fix it soon, as it can impact performance and emissions.
Will this code come back after clearing it?
If the underlying issue isn't fixed, yes, the code is likely to return.
Why does this code sometimes appear with other codes?
Multiple sensor issues can arise from common wiring failures or faults in the exhaust system.
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