OBD-II code · Powertrain (generic)
P051F PCV Filter Restriction
The pressure or flow sensor in the PCV path detects increased restriction across the oil-mist filter element. Once saturated with oil mist, the filter no longer passes blow-by gas, raising crankcase pressure and pushing oil past seals.
Is it safe to drive with P051F?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyPCV filter saturated with oil mist
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1 h
- Emissions test
- Likely to fail
- Parts involved
- Pcv Filter, Crankcase Pressure Sensor A
Related codes
- P051CCrankcase Pressure Sensor A Circuit Low
- P051DCrankcase Pressure Sensor A Circuit High
- P051ECrankcase Pressure Sensor A Circuit Intermittent or Erratic
- P0520Engine Oil Pressure Sensor or Switch A Circuit
- P0521Engine Oil Pressure Sensor/Switch Range/Performance
- P0522Engine Oil Pressure Sensor/Switch Low Voltage
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.