What are the possible causes of the BMW P129C code?
- Faulty ambient pressure sensor
- Ambient pressure sensor harness is open or shorted
- Poor electrical connection in the ambient pressure sensor circuit
How to fix the BMW P129C code?
Start by checking the “Possible Causes” listed above. Visually inspect the wiring harness and associated connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
What are the possible symptoms of the BMW P129C code?
- Check Engine Light on (or Service Engine Soon warning light)
What does the BMW P129C code mean?
The Engine Control Module (ECM) monitors the ambient pressure sensor. The ECM sets the OBDII code when the ambient pressure sensor does not meet factory specifications.