Wiring problems of the 2000 BMW 323

2000 BMW 323i - eml, check engine soon and dsc lights came on and car powered down on the freeway (braked itself and would not accelerate). Needed tow to dealer. Car required replacement of engine throttle body and engine wiring harness and programmed the dme (digital motor electronics) . This did not correct problem - throttle body had to be replaced again. This did not correct problem and after picking up car at dealership the service engine soon light came on again. This required the relay to be replaced. The day after the car was picked up the door and window locks were inoperable intermittently and the gear selector light would go out at the same time. This required replacement of the general module. Total repair time - approximately 1 month.