Exhaust Gas Temperature Sensor Circuit Malfunction (Bank 1)
There's a problem with the exhaust gas temperature sensor circuit.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The vehicle's computer is not getting the right signals from the exhaust gas temperature sensor. This can happen if the sensor is faulty or if there’s an issue like a broken wire or bad connection.
What the computer is actually seeing
The engine control module (ECM) monitors the exhaust gas temperature sensor for voltage signals. Normally, it expects 0.5 to 4.5 volts based on gas temperature. If the voltage is below 0.2 volts or above 4.8 volts, the ECM sets this code.
What a healthy reading looks like
0.5 to 4.5 volts for normal operation.
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. Check for any visible damage to the wiring or connectors of the exhaust gas temperature sensor. Is anything broken or corroded? (Yes: Repair or replace, No: Continue)
- 22. With the ignition on, measure the voltage at the exhaust gas temperature sensor connector. Is the reading between 0.5 and 4.5 volts? (Yes: Sensor is likely fine, No: Continue)
- 33. Disconnect the sensor and check the wiring back to the ECM for shorts to ground or power, and continuity. Is the wiring intact? (Yes: Replace the sensor, No: Repair the wiring)
- 44. Clear the code and test drive the vehicle to see if the code returns. Did the code come back? (Yes: Investigate further for ECM issues, No: Repair successful)
Common causes
- Faulty exhaust gas temperature sensor
- Wiring issues or damaged connectors
- Short circuit in the harness
- Open circuit in the wiring
- Exhaust system leaks affecting sensor readings
Typical repair cost
$$
Related codes
Frequently asked questions
Can I still drive my vehicle with this code?
Yes, but you should fix it soon to prevent issues with emissions and performance.
Will this code come back after clearing it?
If the underlying issue isn't fixed, it's likely to return.
Why does this code sometimes pair with others?
It can occur with other exhaust-related codes if there's a common wiring issue or multiple sensors failing.
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