2001 BMW 325i Q&A
2001 BMW 325i Question: why my car stopped the engine when i was driving
Sounds like you lost your fuel pressure or fuel pump!! - Sun Valley Imports Inc.
Could be a serious problem, first I'd check the oil levels and the condition of the oil, if I recall lack of oil flow through the engine for lubrication will cause the engine to shut down to protect itself from further damage, I believe their are sensors put inplace for this protection. - Frankieq