2021 BMW M4 Service and Repair Manual

This factory service and repair manual for the 2021 BMW M4 narrows to a single body, the two-door coupe, with Base and Competition trims and one turbocharged 3.0-liter inline-six, double overhead camshafts, gasoline. With only one shell to document, the body, glass and interior procedures run without alternates, and the mechanical sections can spend their length on the engine, driveline and chassis: removal sequences, clearances, torque figures and the tests that confirm the work afterward.

Engines covered

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

Body styles covered

• 2-door coupe

Trims covered

• Base
• Competition

Known issues on the 2021 M4. Two recalls sit on the record for this year. One covers a front seat belt retractor that may not function as intended, so the belt cannot hold an occupant properly in a crash. The other is a braking fault: inside the integrated brake system, a rotor and shaft that were not welded correctly can separate under hard braking, costing the car its anti-lock function and much of its braking assistance. One owner complaint is recorded, against the service brakes, the same hydraulic and control material this manual diagnoses.