One problem related to alternator/generator/regulator has been reported for the 2003 BMW 3 Series. The most recently reported issues are listed below.
In 2010 the sunroof went bad I talked to a BMW dealer and they told me they have problems with them, in August of 2011 I noticed that my tail lights and blinkers were not working proper,nor was my horn,and the drivers window regulators are binding up, also a brake hose from my brake booster to the engine is collapsed in two spots. ??.
| Electrical System problems | |
| Wiring problems | |
| Alternator/generator/regulator problems | |
| Battery Dead problems |