Dales Super Store - Barometric Air Pressure (BAP) Sensor
What does a Barometric Pressure Sensor (BAP) do?
The BAP sensor reads the barometric pressure. The PCM uses this information to make adjustments to fuel trim and engine timing. The engine requirements are quite different when driving in San Diego at sea level as compared to Denver at 5,000 feet.
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NEW 03-04 Ford 6.0 Powerstroke Barometric Sensor | 4C2Z12A644A, 4C2Z12A644AA, AS405 | 2003-2007 Ford Powerstroke 6.0LNew
Where are these Barometric Pressure Sensors (BAP) located?
Standalone BAP sensors are typically mounted on the firewall or the inside fender skirt. Late model Barometric sensors are incorporated into the MAP sensor and may be mounted on the intake manifold.
Will a malfunctioning Barometric Pressure Sensor illuminate the check engine light or affect vehicle operation?
Yes, a failing BAP / BARO sensor can illuminate the MIL, and may cause drivability problems such as stumbling, stalling, and sluggish acceleration.
What are the common causes of failure?
Typically these sensors fail due to exposure to the elements as the result of mounting location.
How to determine if these sensors are malfunctioning?
The Barometric sensor can be checked with a scan tool by comparing the scan tool readout to the local barometric reading. Standalone Ford sensors require a special tool to determine if the sensor is functioning properly. The ECM will set DTC P0105 when there is an open or short in the BAP circuit. There is a Fail-Safe strategy that turns on when this code is detected. The PCM uses a predetermined ignition timing and AF trim to maintain emission levels.
