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P0181: Fuel temperature sensor A range or performance problem

The fuel temperature sensor gives readings that do not match other engine data. It is usually the sensor itself or a poor contact at its connector.

Code P0181 at a glance
CodeP0181
SystemEngine and transmission
GroupP01xx, Air and fuel metering
TypeGeneric: it means the same on every make
Can you keep driving?Yes, no rush

What P0181 means

The signal is there, but the ECU does not believe it: for example, on a cold engine it differs a lot from coolant or intake air temperature, or it never changes. Which sensor is A is decided by each manufacturer. This is not a clear break in the circuit but a reading that does not add up.

Most common causes

  • Poor contact or moisture in the sensor connector
  • Drifting or faulty fuel temperature sensor
  • High resistance in the wiring due to corrosion
  • Faulty coolant or intake air temperature sensor that makes the comparison fail

Symptoms

  • Engine warning light on
  • Slightly worse starting when cold or hot
  • Small increase in fuel consumption
  • Sometimes no symptoms

Can you drive with P0181?

Yes, no rush You can drive normally. The effect on how the car runs is usually small, though it is worth fixing at the next service.

How to check it

On a cold engine after several hours parked, compare fuel, coolant and intake air temperature on the reader: they should be similar. If the fuel reading is far off, its sensor is the prime suspect.

How to read and clear P0181 with Final OBD

Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P0181 with this same explanation and whether it’s confirmed, pending or permanent.

With Free you read this code with its short description for nothing, and clear it if the engine stores it over standard OBD. With Pro you get the full explanation, how the car was running when it was logged (revs, temperature, load) and clearing in every control unit.

Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before the ITV. It’s all in how to read and clear fault codes and in the ITV and OBD.

Similar codes

P0181 is a generic code, so it means the same on any make, for example on BMW, Ford, Mercedes-Benz, Peugeot, Renault, Volkswagen. See what Final OBD does on your car in makes and models.

What does code P0181 mean?

The signal is there, but the ECU does not believe it: for example, on a cold engine it differs a lot from coolant or intake air temperature, or it never changes. Which sensor is A is decided by each manufacturer. This is not a clear break in the circuit but a reading that does not add up.

Can you drive with P0181?

You can drive normally. The effect on how the car runs is usually small, though it is worth fixing at the next service.

How do you clear P0181?

With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P0181 comes back.