P00F1
Intake Air Temperature Sensor 3 Circuit Intermittent/Erratic Bank 2.
- 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
- F1
- FaultThe specific fault in that area
What it means
P00F1 is a generic code meaning the engine control unit has seen an intermittent or erratic signal from intake air temperature sensor 3 on bank 2. The reading jumped, dropped out or changed implausibly quickly compared with what the control unit expected, so it flagged a circuit fault. Which sensor is 'number 3' and where it sits depends on the engine, so check the model-specific layout.
Symptoms
- Engine warning light on
- Rough or unstable idle in some cases
- Hesitation or poor throttle response
- Reduced power if the control unit uses a default temperature value
- Slightly higher fuel consumption
- Hard starting or uneven running when hot or cold
Possible causes
- Loose, corroded or damaged connector at the intake air temperature sensor 3likely
- Chafed, stretched or intermittently open or shorted wiring between the sensor and the control unitlikely
- Faulty intake air temperature sensor 3 giving an erratic signallikely
- Poor sensor ground or reference voltage supply shared with other sensorspossible
- Wiring routed near heat, vibration or sharp edges causing intermittent faultspossible
- Fault inside the engine control unit input circuitrare
How to diagnose
- Read all stored and pending codes and note any other temperature, airflow or sensor supply codes
- Review freeze frame data to see engine speed, load and temperatures when the fault set
- Check live data for intake air temperature sensor 3 and compare it with other intake temperature readings on a cold engine; it should be similar and change smoothly
- Inspect the sensor, connector and wiring for damage, moisture, corrosion, bent pins or rubbing
- With the engine running or key on, wiggle the harness and connector while watching live data for spikes or dropouts
- Check the sensor supply and ground at the connector against the model-specific wiring diagram
- Measure sensor resistance at different temperatures and compare with manufacturer specifications
- Test wiring for continuity, short to ground and short to voltage with the control unit disconnected, following the wiring diagram
How to fix
- Repair or replace damaged wiring and terminals
- Clean, secure or replace a corroded or loose connector
- Replace intake air temperature sensor 3 if its readings are erratic or out of specification
- Repair faulty sensor ground or supply circuits
- Re-route and secure the harness away from heat and abrasion
- Replace or repair the control unit only after all wiring and sensor faults are ruled out
Can I keep driving?
Low severity
The car can usually be driven for a short time while you arrange a repair, as the control unit will use a substitute value. Book it in soon, especially if the car runs badly or loses power.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.