Engine Fuel Temperature Sensor 1
Indicates a high reading from the fuel temperature sensor.
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What it means (plain English)
The fuel temperature sensor measures how hot the fuel is before it goes to the engine, and if it reads too high, it could signal a problem like overheating or an issue with the sensor itself.
What the computer is actually seeing
The engine control unit (ECU) monitors the fuel temperature sensor voltage, which should typically range from 0.5V to 4.5V based on temperature changes. If the reading exceeds predefined limits, the code is triggered.
What a healthy reading looks like
Fuel temperature should be between 20°C to 80°C (68°F to 176°F).
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 fuel temperature sensor wiring and connector for damage or corrosion. Repair if needed.
- 22. Measure the fuel temperature using a reliable thermometer. Compare this with the sensor reading.
- 33. If the sensor reads higher than the expected temperature, test the sensor's resistance (should be around 2.5kΩ at 20°C); replace if out of spec.
- 44. Check the vehicle for fluid leaks or overheating issues that might affect fuel temperature.
- 55. Clear the code and run the vehicle to see if it returns. If it does, consider replacing the sensor.
Common causes
- Faulty fuel temperature sensor
- Wiring issues or loose connections
- Excessive fuel temperature due to poor cooling
- ECU programming error
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 possible engine performance issues.
Will this code come back?
If the underlying issue isn't fixed, yes, it will likely return.
What does this sensor affect?
It helps manage how efficiently the engine burns fuel, so it's essential for performance.
Working a real vehicle right now?
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