2005 BMW 525I Electrical System Problems

I am encountering persistent issues with my 2005 BMW 525i. Despite having replaced several critical components, including the ignition coils, spark plugs, mass air flow sensor, and throttle body sensors, the vehicle continues to experience performance problems, specifically failing to advance beyond the fourth cylinder when driving uphill. After conducting numerous diagnostic tests, I have concluded that there may be an air leak in the intake manifold. Additionally, after prolonged use under these conditions, the positive battery cable from the trunk has shown signs of overheating, evidenced by smoke, which I suspect is related to repeated uphill driving. While the vehicle performs adequately on flat surfaces, it exhibits hesitation and jerking once it surpasses the fourth cylinder.

FRONT PASSENGER SEAT OCCUPANCY SENSOR HAS FAILED. REAR LEFT HAND BRAKE/BACKUP LIGHT IS PROBLEMATIC AND INTERMITTENTLY WORKS, USUALLY ONLY SHOWS UP ON CAR'S DASHBOARD WHILE IN REVERSE, BUT SOMETIMES WILL STAY ON-SCREEN DURING DRIVING. FRONT ASHTRAY OUTLET/CIGARETTE LIGHTER DOESN'T WORK.

SUNROOF DRAIN CLOGGED INTO TRUNK CAUSING FIRE IN BATTERY COMPARTMENT AND SPARE TIRE AREA. VEHICLE WAS STATIONARY IN SHOP AFTER NOT BEING RUN FOR HOURS.

ON APRIL 11, 2015. I WAS TAKING MY VEHICLE TO MY MECHANIC TO GET IT SERVICED AFTER SITTING ALL WINTER. AS I WAS DRIVING I NOTICED SMOKE COMING FROM THE REAR OF THE VEHICLE. I PULLED OVER, COULD NOT LOCATE THE SOURCE. I CONTINUED TO MY MECHANIC. ONCE THERE WE OPENED THE TRUNK, WE NOTICED AND SMELLED SOMETHING BURNING. WE TOOK OUT THE TIRE AND NOTICED WATER IN THE WHEEL WELL, WHICH MADE AN ELECTRICAL COMPONENT SPARKING, SMOKING AND ON FIRE. I HAD THE VEHICLE TOWED TO BMW. THEY STATED THE WATER DAMAGED THE MICRO POWER MODULE. BMW PAID FOR THE REPAIRS, AND RELOCATED THE MODULE AWAY FROM THE WHEEL WELL. I FEEL WHERE IT WAS PLACED PREVIOUS WAS VERY DANGEROUS. IF I HAD ANY COMBUSTIBLE ITEM IN MY TRUNK MY BMW WOULD HAVE FULLY CAUGHT FIRE. BMW SHOULD RECALL ALL VEHICLE AND RELOCATION ANY ELECTRICAL COMPONENTS THAT CAN BE...