OBD-II code · Powertrain (generic)
P051A Crankcase Pressure Sensor A Circuit
A general circuit fault is detected on the crankcase pressure sensor A - typically used to monitor PCV operation and detect a clogged separator or disconnected hose.
Is it safe to drive with P051A?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOpen in sensor or wiring
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–1.4 h
- Emissions test
- Likely to fail
- Parts involved
- Crankcase Pressure Sensor A
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.