P01F2
O2 Sensor Circuit Low Voltage Bank 1 Sensor 4
Generic OBD-II
Common symptoms
What you'll notice
- Check and replace faulty oxygen sensor in bank 1 sensor 4
- Inspect and repair any damaged or loose wiring connections to the oxygen sensor
- Clean or replace dirty air filter and ensure proper air flow to the sensor
- Check and fix any exhaust leaks that could be affecting the sensor readings
Common causes
Most likely first
- Faulty oxygen sensor
- Loose or damaged wiring/connectors in the oxygen sensor circuit
- High fuel pressure
- Cylinder misfire
- Engine vacuum leak
How to diagnose & fix
Work through it in order
- Check Engine Light (CEL) is illuminated
- Decreased fuel efficiency
- Rough idling or stalling
- Poor acceleration or hesitation
- Increased emissions
Read & clear P01F2 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.