2020 BMW 420i Gran Coupe Service and Repair Manual

This factory service and repair manual for the 2020 BMW 420i Gran Coupe is written around a single drivetrain in a single body: the turbocharged, gasoline-fueled 2.0L inline-four of 122 cubic inches with double overhead camshafts, mounted in a four-door hatchback sold as Executive and Sport Line. That consistency is useful on the shop floor, because a torque value or clearance found in these pages needs no cross-checking against another engine option. Coverage extends from engine mechanical through the driveline, brakes, steering, climate control and body electrics.

Engines covered

• 2.0L inline-four (122 cu in) — DOHC, turbocharged, gasoline

Body styles covered

• 4-door hatchback

Trims covered

• Executive
• Sport Line

Known issues on the 2020 420i Gran Coupe. Service on this car concentrates where heat and pressure do. The manual gives the specifications for the cooling circuit and its bleed procedure, the charge-air path and its connections, the timing drive and valvetrain on the twin-cam head, and the fuel and ignition systems whose readings decide the cause of a rough-running fault. The 2020 420i Gran Coupe's four-door body section covers latches, hinges, glass and the harnesses feeding them, and the wiring diagrams trace each circuit from fuse and module out to the component.