P00F3 code meaning
Humidity Sensor Circuit Range/Performance
Powertrain system Generic code P00xx codes Check engine light
What P00F3 means
The humidity sensor measures the relative humidity of the intake air; on documented vehicles it is built into the mass air flow sensor or a combined sensor. The engine control module uses the value, for example, to correct torque and in emission models. One documented design is capacitive and reports humidity as a pulsed signal with a duty cycle that the control module converts back. P00F3 is a plausibility fault: the reading is electrically valid but implausible. One manufacturer documents it being set shortly after starting in heat and extremely dry air; if the live value shows an implausibly low humidity, the air flow sensor with the integrated humidity sensor should be replaced, otherwise the fault is treated as intermittent.
P00F3 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyEasy, DIY possible
- Typical labor0.3 to 1 hours
- Clears after repairAfter a drive cycle
Symptoms of P00F3
- Check engine light on
- Usually no noticeable symptoms
- Slightly uneven torque or higher consumption possible
Common causes of P00F3
- Most likelyHumidity sensor or combined air flow sensor faulty
- PossibleExtremely dry and hot air making the test borderline
- Less likelyContamination or oil mist on the sensing element
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Humidity sensorMass air flow sensorHumidity sensor wiring
What each part of P00F3 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 0 | Area: fuel and air metering and auxiliary emission controls. |
| F3 | The exact fault in that area. |
What to do next
- Note P00F3 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P00F3
What does P00F3 mean?
P00F3 means "Humidity Sensor Circuit Range/Performance". The humidity sensor measures the relative humidity of the intake air; on documented vehicles it is built into the mass air flow sensor or a combined sensor. It is a generic code, so it means the same on every make.
Is it safe to drive with P00F3?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P00F3 fail an emissions test?
Yes, it can. P00F3 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P00F3 to fix?
Difficulty: easy. A typical repair takes 0.3 to 1 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P00F3 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.