One problem related to mass air flow sensor has been reported for the 2001 BMW 325. The most recently reported issues are listed below.
Gm5, and mass airflow sensor not working on my 2001 325i BMW. It shuts off when get a dead stop and about to take off again. The doors will unlock and lock after pressing the buttons multiple times. The remote as well will not unlock or lock the doors everytime. Its at random with no specific pattern.