Code
DF098
RENAULT
D
-> P0180 - Fuel temperature sensor circuit
Views:
UK: 5
EN: 8
RU: 5
AI status
Completed
Completed
100%
Causes
- Faulty fuel temperature sensor (NTC thermistor)
- Open or short in sensor wiring (to power, ground or signal)
- Poor/ corroded connector or pins at sensor or ECU
- Water/fuel contamination in connector
- High resistance due to damaged insulation or broken conductor
- Incorrect replacement sensor or wrong part installed
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Possible poor cold/hot start behavior
- Reduced drivability or rough idle (if ECU uses fuel temp for fueling correction)
- Increased fuel consumption and emissions
- Possible limp mode or reduced engine performance in some vehicles
- Code may be stored with minimal or no drivability symptoms
What to check
- Read and record freeze frame and fault history with a diagnostic scanner
- Perform a visual inspection of the fuel temperature sensor, wiring harness and connectors for damage, corrosion, contamination or loose terminals
- Check for signs of fuel or water ingress at the sensor connector
- Backprobe the sensor connector and check reference voltage and signal while key ON and during engine run
- Measure sensor resistance at ambient and when heated/cooled (compare to expected values)
- Wiggle wiring and connector while monitoring live data for intermittent changes
Signal parameters
- Typical reference: single-ended temperature sensor signal to ECU; reference voltage commonly 5 V (confirm with vehicle data)
- Typical thermistor resistance examples (approximate; consult service manual): ~6 kΩ at 0 °C, ~2.5 kΩ at 20 °C, ~300 Ω at 80 °C (resistance decreases as temperature rises)
- Typical sensor voltage at ECU signal pin: about 0.5–4.5 V depending on fuel temperature (cold = higher resistance → higher or lower voltage depending on circuit type—confirm polarity in service data)
- Expected: no open circuit (infinite resistance) and no direct short to battery or ground
Diagnostic algorithm
- Connect a diagnostic scanner, read and record DF098/P0180 freeze frame and live fuel temperature PID
- Visually inspect fuel temperature sensor, connector and wiring for damage, corrosion, fuel/water contamination; repair or clean as needed
- With ignition OFF, disconnect sensor and measure resistance across sensor terminals; compare to service specification at ambient temperature
- If possible, change sensor temperature (warm with heat source or cool with ice/wet cloth) and confirm resistance changes accordingly
- With sensor connected, backprobe the signal and ground pins at the sensor with ignition ON and measure reference voltage and signal voltage; verify reference supply to sensor (often 5 V) and good ground
- Check continuity from sensor connector to ECU pins and check for shorts to battery positive and chassis ground
- Perform a wiggle test on the wiring while monitoring live data for intermittent faults
- If wiring is open/shorted or connector damaged, repair harness and replace connector/sensor as required
- After repairs, clear codes and perform test drive to ensure code does not return and that fuel temperature PID behaves normally
- If all wiring and sensor tests are good and code persists, follow manufacturer procedures to test/replace ECU or submit for advanced module testing
Likely causes
- Sensor internal failure (thermistor out of spec)
- Short to ground or to battery voltage on signal wire
- Open circuit between sensor and ECU
- Corroded/loose connector causing intermittent contact
- Connector pin pushed out or bent at ECU or sensor
Fault status
Status
P0180 — Fuel temperature sensor circuit: signal out of range / open / short. Inspect/replace fuel temperature sensor, wiring and connector; verify ECU input.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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