OBD-II code · Powertrain (generic)
P01F1 O2 Sensor Circuit Bank 1 Sensor 4
Generic electrical fault on the bank 1, sensor 4 oxygen sensor (fourth sensor downstream — used on systems with multiple cat stages or NOx-trap diagnosis).
Is it safe to drive with P01F1?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySensor failed
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
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
- Oxygen Sensor B1s4, Sensor Wiring
Related codes
- P01EEEngine Coolant Heater B Control Circuit High
- P01EFEngine Coolant Heater B Control Circuit Performance
- P01F0Coolant Temperature Relapsed Below Diagnostic Monitoring Temperature
- P01F2O2 Sensor Circuit Low Voltage Bank 1 Sensor 4
- P01F3O2 Sensor Circuit High Voltage Bank 1 Sensor 4
- P01F4O2 Sensor Circuit Slow Response Bank 1 Sensor 4
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.