OBD-II code · Powertrain (generic)
P00F4 Humidity Sensor Circuit Low
Humidity sensor signal voltage below expected range. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Is it safe to drive with P00F4?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySignal wire shorted to ground
- Less likelyConnector pins corroded - high contact resistance
- Less likelyHarness chafing through insulation
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1.5 h
- Emissions test
- Likely to fail
- Parts involved
- Humidity Sensor, Sensor Wiring
Related codes
- P00F1Intake Air Temperature Sensor 3 Circuit Intermittent/Erratic Bank 2
- P00F2Humidity Sensor Circuit/Open
- P00F3Humidity Sensor Circuit Range/Performance
- P00F5Humidity Sensor Circuit High
- P00F6Humidity Sensor Circuit Intermittent/Erratic
- P00F7Barometric Pressure - Turbocharger/Supercharger Inlet Pressure Correlation Bank 2
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.