P00BE - Mass or Volume Air Flow 'B' Circuit Range/Performance - Air Flow Too Low

P00BE is triggered when the Engine Control Module (ECM) detects that the signal from the Mass Air Flow (MAF) sensor 'B' is below the expected range based on engine load, RPM, and throttle position. This code specifically points to a flow rate that is lower than the calibrated threshold. It can be caused by a faulty sensor, but is frequently related to air leaks after the sensor, a restricted air intake, or debris on the MAF sensing element. The ECM compares the MAF signal to a lookup table and other sensors like the MAP (Manifold Absolute Pressure) to verify plausibility. If the deviation exceeds specific parameters (typically a duty cycle or voltage deviation), the MIL is illuminated and the vehicle may enter limp-home mode to protect the engine.