2021 BMW M440i Service and Repair Manual

This factory service and repair manual for the 2021 BMW M440i covers a two-door convertible in Base trim, powered by a 3.0-liter inline-six mild hybrid with double overhead camshafts, turbocharged and running on gasoline. There is one engine here and one body, so nothing in the specifications has to be qualified by variant. Fuel, ignition, boost control and cooling procedures all describe that six, and the electrical material takes in the mild hybrid hardware wired into the car's starting and charging system.

Engines covered

• 3.0L inline-six mild hybrid — DOHC, turbocharged, gasoline

Body styles covered

• 2-door convertible

Trims covered

• Base

Known issues on the 2021 M440i. Five recalls sit on the federal record for this year. One concerns the connection between the 48-volt battery and the starter-generator, which may have been assembled improperly and can build resistance at the terminals until it becomes a fire risk. Another covers a head-thorax air bag that may not deploy as intended in a side impact. A third involves a rearview camera image that can go missing or come through reduced, leaving a driver who relies on it without the view behind. Four complaints are on record, one apiece against the seat belts, the engine and the service brakes.