I would first have the engine checked for faults. If you have multiple faults stored for fuel injectors, camshaft control and cam sensors and possible crankshaft sensor, you might have a faulty IVM module. Check fuel pressure and voltage supply to the fuel pump. The fuel pump is controlled by the B pillar satellite sensor for the airbag on the passenger side.
SOURCE: BMW 2003 745LI brought from USA check engine light
I had a similar problem, had it diagnoses and found out it was actually the thermostat not allowing the engine to reach normal operating temperature thus signaling the Cat to throw an emission code. It sounds far fetched but the diagnosis and fix was correct. I had the thermostat changes, fuel injection service, new spark plugs installed all for $350 and I have never seen that "Check Engine Light" again. Plus, my car drives like new with improved gas mileage.
SOURCE: When is cabin filter located on 2003 BMW 745Li
Filters is inside black plastic cover. Remove it when pull up this cover an outside side.
SOURCE: We just purchased a 2003 745Li BMW. My wife pushed
In Your BMW is a electronic park brake and solution nr 1 (Kato tech) is using for manual park brake system! In to service users manual book described as the brake trigger for the ride. When you put the car on the diagnosis, find out where and what is wrong. Certainly do not look for error as there is a solution No.1
SOURCE: Bmw 2003 745LI: My driver side door does not open
This drawing will help you find it? It can be broken only in the rubber tube for hanging doors.
SOURCE: 2003 bmw 745li vibration at take off
The engine will be going to a few poor rolls of ignition. It makes a bad ignition coil! A common problem with 745i
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