Boost Pressure Sensor Pressure Too High
Table of contents
P12A9 BMW Possible Causes
- Faulty Boost Pressure Sensor
- Boost Pressure Sensor harness is open or shorted
- Boost Pressure Sensor circuit poor electrical connection
How do I fix code P12A9 BMW?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the P12A9 BMW code
The cost of diagnosing the P12A9 BMW code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P12A9 BMW Description
During the control module’s shutdown phase the diagnostic function monitors the barometric- pressure sensor, intake-manifold pressure sensor, and boost-pressure sensor to determine whether they are all measuring the same
pressure. The ECM sets the OBDII code when the Boost Pressure Sensor is not to factory specifications.