P008F - Engine Coolant Temperature / Fuel Temperature Correlation
Last updated:
System
Powertrain (Engine & Gearbox)
Related Fault Codes
Technical Description
P008F is stored when the Engine Control Unit (ECU) detects an implausible correlation between the Fuel Temperature Sensor and the Engine Coolant Temperature (ECT) sensor. This check typically occurs during a cold start after a long soak period. The ECU expects both sensors to report similar ambient temperatures. If the deviation exceeds the calibrated threshold (typically 10-15°C), the ECU determines that one of the sensors is 'skewed' or providing inaccurate data, which can affect fuel density calculations and emission controls.
Possible Causes
Faulty Fuel Temperature Sensor (skewed resistance)
Faulty Engine Coolant Temperature (ECT) sensor
Wiring harness resistance or connector oxidation
Use of engine block heater causing uneven sensor heating before start
Symptoms
Recommended Solution
- 2. 3. 4. 5. Replace the failing sensor and clear adaptation values if required.
Mechanic's Tip
Before replacing expensive components, always double-check wiring and connections. 80% of all sensor faults are actually due to corroded contacts or broken wires.
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