Engine Exhaust Temperature - Bank 1 Sensor 1
Engine exhaust temperature sensor for bank 1 is out of range.
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What it means (plain English)
The computer is reading the exhaust temperature sensor on bank 1 and it's showing a value that's way off, indicating either a fault with the sensor or an actual exhaust issue.
What the computer is actually seeing
The engine control module (ECM) monitors the exhaust temperature sensor output voltage, which should be around 0.5 to 4.5 volts depending on the temperature. A voltage outside this range indicates a problem.
What a healthy reading looks like
Expected exhaust temperature is typically between 600°F (315°C) to 1,200°F (649°C) during normal operation depending on load and throttle position.
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 exhaust temperature sensor wiring and connectors for any damage or corrosion.
- 22. Verify the exhaust temperature sensor output voltage with a multimeter; it should be within 0.5 to 4.5 volts when the engine is running.
- 33. Inspect for any exhaust leaks or obstructions near the sensor location that might impact readings.
- 44. If the wiring and sensor check out, replace the exhaust temperature sensor.
Common causes
- Faulty exhaust temperature sensor
- Wiring issues (shorts or opens in the harness)
- Exhaust leak or obstruction
- Corroded or damaged connectors
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable, but you should fix it soon to avoid further engine damage or emissions issues.
Will this code come back after clearing?
If the underlying issue isn't fixed, it's likely to return.
Why is this related to other temperature codes?
Different temperature sensors monitor separate parts of the exhaust system and may trigger when there's a common fault.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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