P124D BMW Possible Causes
- Faulty NOx sensor
- NOx sensor wiring harness is open or short-circuited
- Poor electrical connection in the NOx sensor circuit
How is BMW P124D Code Repair Performed?
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.
Possible Symptoms
- Engine light on (or service engine soon warning light)
P124D BMW Meaning
The Engine Control Module (ECM) monitors the NOx sensor. The ECM sets the OBDII code when the NOx sensor does not meet factory specifications.