2021 BMW M850i xDrive Service and Repair Manual

This factory service and repair manual for the 2021 BMW M850i xDrive covers a car offered in two bodies and two trims: a two-door convertible and a two-door coupe, listed as Base and Coupe, all with the same turbocharged 4.4L V8, double overhead cams, gasoline. One engine across the range means the powertrain half of the book reads as a single set of specifications, while the body half splits along the roof, where the convertible's mechanism and wiring have no counterpart on the coupe.

Engines covered

• 4.4L V8 — DOHC, turbocharged, gasoline

Body styles covered

• 2-door convertible
• 2-door coupe

Trims covered

• Base
• Coupe

Known issues on the 2021 M850i xDrive. The manual documents the procedures and specifications for the V8 and its fuel, ignition and cooling systems, the transmission and driveline routines, and the brake, suspension and steering figures that keep a heavy two-door in alignment. The convertible's roof mechanism, the body electrics and the restraint systems are covered with wiring diagrams and diagnostic tests of their own.