Exhaust Gas Temperature Sensor - Bank 1 Sensor 1
Indicates an issue with the exhaust gas temperature sensor on Bank 1.
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What it means (plain English)
The exhaust gas temperature sensor measures how hot the exhaust gases are after leaving the engine. If the sensor is malfunctioning, it can signal problems with emissions control or the exhaust system.
What the computer is actually seeing
The engine control module (ECM) tracks the voltage signal from the exhaust gas temperature sensor, which typically varies between 0.5V (cold) to about 2.5V (hot). If the voltage is outside of this range, it triggers the fault.
What a healthy reading looks like
Expect a voltage signal between 0.5V and 2.5V at normal operating temperatures; outside of these values, the code may trigger.
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 going to the exhaust gas temperature sensor. Look for signs of wear, corrosion, or loose connections. If any issues are found, repair them and clear the code to see if it returns.
- 22. Measure the voltage output of the exhaust gas temperature sensor with a multimeter while the engine is running. If the voltage is out of the expected 0.5V to 2.5V range, replace the sensor next.
- 33. Inspect the exhaust system for leaks or damage. Leaks could affect the temperature readings of the sensor. Repair any leaks found, then check if the code reappears.
Common causes
- Faulty exhaust gas temperature sensor
- Wiring or connector issue (corrosion, damage)
- Faulty ECM
- Exhaust leaks affecting temperature readings
Typical repair cost
$$#
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally safe to drive but you should fix it soon to avoid emissions issues or performance loss.
Will this code come back after I clear it?
If the underlying issue isn't fixed, yes, it will likely return.
Why does this code sometimes pair with SPN 3461?
SPN 3461 also relates to exhaust gas temperatures, so issues with the sensor or wiring can trigger multiple related codes.
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