2013 BMW 335I Engine And Engine Cooling Problems

The contact owns a 2013 BMW 335i. The contact stated that while driving at an undisclosed speed, the check engine warning light illuminated. The contact stated that the following day, while attempting to start the vehicle, the vehicle failed to start. The contact stated that after several attempts, the vehicle started. The vehicle was taken to an independent mechanic, where it was diagnosed with battery failure. The contact was informed that the battery needed to be replaced. The vehicle was repaired; however, the failure reoccurred. The vehicle was taken back to the independent mechanic, and the battery was replaced for the second time. The vehicle was repaired; however, the failure reoccurred. The vehicle was taken back to the independent mechanic and the battery was replaced a third time, but the failure reoccurred. The vehicle was taken back to the independent mechanic, where it was diagnosed with coolant pump failure. The...

RATTLE NOISE COMING FROM ENGINE COMPARTMENT OR INSIDE OF DASH UPON ACCELERATION (2000-2500RPM) ON COLD STARTS. CAN CHANGE NOISE BASED UPON ACCELERATION. GOES AWAY AFTER MOTOR WARMS UP (USUALLY 15 MINUTES) SO GETTING DIAGNOSED AT THE DEALER IS DIFFICULT. REPEATEDLY GET "CAN'T REPRODUCE PROBLEM" BACK FROM THE DEALER. WIDESPREAD PROBLEM ACROSS MULTIPLE PLATFORMS (2012+ 3 SERIES, 2014+ 4 SERIES). *TR