Fuel Temperature Sensor 1 Circuit Range/Performance Problem
Indicates an issue with the fuel temperature sensor's circuit performance.
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 fuel temperature sensor measures how hot the fuel is. If it's giving bad readings, the engine might not run properly because the computer thinks the fuel is too hot or too cold.
What the computer is actually seeing
The engine control module expects the fuel temperature to be within a specific range; any readings outside of that range signal a fault.
What a healthy reading looks like
Fuel temperature should be around 70-90°C (158-194°F) during 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. Inspect the fuel temperature sensor wiring and connectors for damage or corrosion. If found, repair and retest.
- 22. Measure the resistance of the fuel temperature sensor; it should be around 2.5k ohms at 25°C (77°F). If it's significantly off, replace the sensor.
- 33. Check the fuel quality. Ensure there are no contaminants. Replace fuel filter if necessary and check for proper flow.
- 44. Use a scan tool to monitor the live data for the fuel temperature sensor while the engine is running. Watch for fluctuating or unstable readings. If readings are erratic, replace the sensor.
Common causes
- Faulty fuel temperature sensor
- Wiring issues or damaged connectors
- Poor fuel quality or excessive contamination
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, it's drivable but fix it soon to avoid potential performance issues.
Will this code come back after repair?
If the repair is effective, it shouldn't return unless there is a new issue.
Why does this code sometimes pair with SPN 6733?
SPN 6733 refers to a circuit fault which may happen with sensor range/performance issues.
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