P00F4
Humidity Sensor Circuit Low
Generic OBD-II
Real-world scan data
Seen in
70
scans in the past year
Found in
<0.1%
of scans
<0.1%
of scans that found faults
Appears alongside · share of P00F4 scans
Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.
Common symptoms
What you'll notice
- Check and clean the humidity sensor connectors and wiring.
- Inspect the humidity sensor for any signs of damage or malfunction, and replace if necessary.
- Reset the vehicle's computer system by disconnecting the battery for a few minutes and then reconnecting.
- Verify and ensure proper voltage supply to the humidity sensor.
- Consult technical service bulletins or manufacturer recommendations for any known issues or specific instructions related to the Humidity Sensor Circuit Low error.
Common causes
Most likely first
- Faulty humidity sensor
- Poor electrical connection or wiring issues related to the humidity sensor
- Moisture or water damage to the humidity sensor or its circuit
- Sensor circuit short or open
- Engine control module (ECM) malfunction or failure
How to diagnose & fix
Work through it in order
- Poor engine performance or decreased power
- Difficulty starting the vehicle
- Stalling or rough idling
- Reduced fuel efficiency
- Check engine light illuminated on the dashboard
Read & clear P00F4 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.