Exhaust Gas Temperature Sensor Circuit High - Bank 1
The exhaust gas temperature sensor is reading higher than expected.
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What it means (plain English)
The exhaust gas temperature sensor monitors the temperature of exhaust gases to help optimize engine performance and emissions. If it reads too high, it means the sensor is detecting temperatures above its threshold, which can lead to improper engine operation, especially with diesel systems due to heat management needs.
What the computer is actually seeing
The engine control module (ECM) receives voltage inputs from the exhaust gas temperature sensor. These voltages should correlate with the temperatures being sensed. An excessively high voltage (typically above 4.5 volts when it should be between 0.5V to 4.5V) triggers this code.
What a healthy reading looks like
Normal exhaust gas temperature sensor readings should be between 0.5 and 4.5 volts, corresponding to temperatures generally between 0°C to 900°C (32°F to 1652°F) depending on the engine state and 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. Check the wiring and connectors of the exhaust gas temperature sensor for any visible damage or corrosion. Repair or replace as necessary. Decision: Are there any issues found? If yes, fix them and retest. If no, proceed to step 2.
- 22. Use a multimeter to measure the voltage output of the exhaust gas temperature sensor at the ECM connector. It should be between 0.5V and 4.5V when the engine is running. Decision: Is the reading in this range? If yes, sensor is likely good. If no, replace the sensor and retest.
- 33. Start the vehicle and monitor exhaust gas temperatures with a scan tool to verify operation. Decision: Are the readings consistent with engine operation? If yes, you’re finished. If no, further diagnosis is required.
Common causes
- Faulty exhaust gas temperature sensor
- Wiring issues or short circuits in the sensor circuit
- Poor connections at the sensor or ECM
- Excessive exhaust temperatures due to engine issues
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
While it's drivable, the engine may run inefficiently, and exhaust temperatures might be higher than ideal, which can lead to other issues.
Will this code come back after I clear it?
It may come back if the underlying issue, such as a faulty sensor or wiring problem, is not resolved.
Why does this code relate to other temperature codes?
Temperature sensors often work together to ensure optimal engine performance and emissions controls, so issues in one can affect readings in others.
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