P00BF 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. 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.

Likely causes

Symptoms

• Check engine light on
• Loss of power
• Rich mixture codes possible

Repair estimate

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

Related codes

References: law.cornell.edu, gsi.ext.gm.com, en.wikipedia.org.