OBD-II code · Powertrain (generic, extended)
P252C Engine Oil Quality Sensor Circuit Low
Sensor signal voltage below the lower limit — typically a short to ground in the signal line or an internal short across the sensor electrode.
Is it safe to drive with P252C?
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
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–2 h
- Emissions test
- Usually unaffected
- Parts involved
- Oil Quality Sensor, Sensor Wiring
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.