One problem related to underhood wiring has been reported for the 2000 BMW 323. The most recently reported issues are listed below.
Ltr from (CA) re 2000 BMW 323i, defective engine wiring harness and throttle body malfunction cause computer failure with sudden loss of power & deceleration at high speeds. The vehicle lost power shortly after the emi, check engine soon, and dsc lights illuminated. The vehicle was towed to a BMW dealer.