OBD-II code · Powertrain (generic)
P01B9 Engine Oil Temperature Sensor B Circuit
Generic electrical fault on engine oil temperature sensor B (second sensor for redundancy or different measurement location).
Is it safe to drive with P01B9?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySensor failed
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Oil Temp Sensor B, Sensor Wiring
Related codes
- P01B6Alternative Fuel Rail Temperature Sensor Circuit Low
- P01B7Alternative Fuel Rail Temperature Sensor Circuit High
- P01B8Alternative Fuel Rail Temperature Sensor Circuit Intermittent/Erratic
- P01BAEngine Oil Temperature Sensor B Range/Performance
- P01BBEngine Oil Temperature Sensor B Circuit Low
- P01BCEngine Oil Temperature Sensor B Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.