P00BF code meaning
Mass or Volume Air Flow B Circuit Range/Performance - Air Flow Too High
Powertrain system Generic code P00xx codes Check engine light
What P00BF means
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.
P00BF at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyEasy, DIY possible
- Typical labor0.3 to 1.5 hours
- Clears after repairAfter a drive cycle
Symptoms of P00BF
- Check engine light on
- Loss of power
- Rich mixture codes possible
Common causes of P00BF
- Most likelyAir flow meter drifting or oil-coated
- PossibleModel value wrong, e.g. faulty manifold pressure sensor or EGR valve stuck open
- Less likelyLeak upstream of the meter causing pulsations
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Mass air flow sensor bIntake ductsManifold absolute pressure sensor
What each part of P00BF means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 0 | Area: fuel and air metering and auxiliary emission controls. |
| BF | The exact fault in that area. |
What to do next
- Note P00BF and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P00BF
What does P00BF mean?
P00BF means "Mass or Volume Air Flow B Circuit Range/Performance - Air Flow Too High". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P00BF?
Drive gently and only to a workshop. With P00BF the car can go into limp mode (reduced power) to protect itself.
Will P00BF fail an emissions test?
Yes, it can. P00BF is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P00BF to fix?
Difficulty: easy. A typical repair takes 0.3 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P00BF clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.