P00BFMass or Volume Air Flow B Circuit Range/Performance - Air Flow Too High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- The control module compares the air mass measured by the air flow meter with the air mass it expects from a model, for example from manifold pressure, boost pressure and throttle position. These codes report the deviation with its direction: "too low" means the meter measures less air than expected, "too high" more. Regulations allow manufacturers to use one code for both directions or separate codes, as here. P00BF concerns air flow meter B, i.e. a second meter, for example in the second intake path of a V engine. Typical causes are a drifting or oil-coated meter or a wrong model value, for example from a faulty manifold pressure sensor or an open exhaust gas recirculation valve. No manufacturer description naming this exact code was found; the explanation follows its documented counterpart.
- What you may notice
- Check engine light on
- Loss of power
- Rich mixture codes possible
- Likely causes
- LikelyAir flow meter drifting or oil-coated
- PossibleModel value wrong, e.g. faulty manifold pressure sensor or EGR valve stuck open
- RareLeak upstream of the meter causing pulsations
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €0 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.