BMW 335i xDrive check engine light remains on after mass air flow sensor replacement, power loss and rpm limited to 2 on BMW 335i xDrive

Some BMW 335i xDrive owners report experiencing persistent check engine light issues even after replacing the mass air flow sensor, along with power loss and RPM limitations capped at 2. Common causes for these problems include a failing throttle body, which may require cleaning or replacement to reset the limp mode. Additionally, vacuum leaks can lead to similar symptoms, so checking for and addressing any leaks is crucial for restoring engine function. Faulty spark plugs are another potential issue that can trigger the check engine light and affect performance, necessitating inspection and proper gapping. Furthermore, some owners find that replacing a worn oxygen sensor can help turn off the service engine light and enhance engine performance. Other potential concerns that could activate the check engine light include issues with the VANOS system, cracked hoses, battery health, wire harness problems, or a failing High-Pressure Fuel Pump (HPFP). It is advisable for owners facing these issues to consult a qualified mechanic or dealership for accurate diagnosis and resolution.