P00BF
Mass or Volume Air Flow B Circuit Range/Performance Air Flow Too High
Generic OBD-II
Common symptoms
What you'll notice
- Check and clean the Mass Air Flow (MAF) sensor
- Inspect and clean the air filter
- Check for any vacuum leaks in the intake system
- Inspect and clean the throttle body
- Check the fuel pressure and replace the fuel filter if necessary
Common causes
Most likely first
- Dirty or clogged air filter
- Faulty mass air flow sensor
- Intake air leaks
- Throttle body issues
- Engine control module (ECM) malfunction
How to diagnose & fix
Work through it in order
- Engine misfire or hesitation
- Decreased fuel efficiency
- Rough idle or stalling
- Difficulty starting the vehicle
- Check Engine Light illuminated (MIL)
Read & clear P00BF yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.