P00F2
Humidity Sensor Circuit/Open.
- Generic
- Powertrain
- Generic code
- Low severity
How this code is built
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- 0
- AreaFuel and air metering, auxiliary emission controls
- F2
- FaultThe specific fault in that area
What it means
P00F2 means the engine control unit has detected an open circuit in the humidity sensor circuit. The signal or supply is missing or out of range, which usually points to a break in the wiring, a poor connector or a failed sensor. Where the humidity sensor is fitted and what it is used for (for example intake air or ambient humidity corrections) depends on the model and engine.
Symptoms
- Engine warning light on
- Slightly rough running or hesitation on some engines
- Poor fuel economy
- Reduced performance or boost limiting on some engines
- No noticeable change in driveability
- Other stored codes for intake air temperature or related sensors
Possible causes
- Damaged, chafed or broken wiring between the humidity sensor and the control unitlikely
- Corroded, loose or pushed-out terminals in the sensor connectorlikely
- Failed humidity sensor (internal open circuit)likely
- Open circuit in the sensor supply or ground feedpossible
- Water or oil contamination of the sensor or connectorpossible
- Fault inside the engine control unitrare
How to diagnose
- Read all stored codes and freeze frame data, and note whether other sensor circuit codes are present or whether the fault returns after clearing.
- Find the humidity sensor for this model and engine using the manufacturer's information, then visually inspect the sensor, its housing and the nearby wiring for damage, rubbing, moisture or contamination.
- Check the connector for bent, pushed-back or corroded terminals and for water ingress; check the terminal tension.
- With the ignition on, view the live humidity sensor data and see whether it is fixed at an implausible value or does not respond.
- Wiggle the harness and connector while watching live data to see whether the fault comes and goes.
- Check the sensor supply, ground and signal circuits against the wiring diagram using a multimeter, and test for continuity and shorts to ground or supply.
- Test the sensor against the manufacturer's specification, or substitute a known good sensor if the wiring tests are good.
- If the wiring and sensor are proven good, check the control unit supply, ground and connector before suspecting the unit itself.
How to fix
- Repair or replace damaged wiring and secure it clear of heat and sharp edges.
- Clean or replace corroded connector terminals, or replace the connector, and seal it against moisture.
- Replace the humidity sensor if it is faulty or contaminated.
- Restore the sensor supply or ground feed if a fault is found in that circuit.
- Replace or repair the control unit only after all other causes have been ruled out, following the manufacturer's procedure.
- Clear the codes and road test to confirm the fault does not return.
Can I keep driving?
Low severity
The car can normally be driven, as the control unit will use a default value, but book it in soon. If the car runs badly, goes into limp mode or the warning light flashes, have it checked sooner.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.