What are the possible causes of the MINI P12A9 code?
- Faulty boost pressure sensor
- Boost pressure sensor harness is open or short-circuited
- Poor electrical connection in the boost pressure sensor circuit
How to fix the MINI P12A9 code?
Start by checking the “Possible Causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
What are the possible symptoms of the MINI P12A9 code?
- Engine light on (or Service Engine Soon warning light)
What does the MINI P12A9 code mean?
During the shutdown phase of the control module, the diagnostic function monitors the barometric pressure sensor, intake manifold pressure sensor, and boost pressure sensor to determine if they all measure the same
pressure. The ECM sets the OBDII code when the boost pressure sensor does not meet factory specifications.