2020 BMW 420i Service and Repair Manual

This factory service and repair manual for the 2020 BMW 420i works from a narrow starting point: one 122-cubic-inch inline-four, twin-cam, turbocharged and gasoline-fueled, in one two-door coupe body. Executive and Sport Line cars are treated as a single machine with two levels of equipment, which is how a shop meets them anyway. From that base the coverage runs outward through the driveline, brakes, suspension, climate control and body electrics, giving torque values, clearances and test procedures for each rather than gathering them into general chapters.

Engines covered

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

Body styles covered

• 2-door coupe

Trims covered

• Executive
• Sport Line

Known issues on the 2020 420i. Nothing on a turbocharged 2.0L asks more of a technician than accurate specifications, and this manual supplies them where the 2020 420i needs them most: oil and coolant capacities, thermostat and pump service, timing chain and camshaft work on the double-overhead-cam head, spark plug and coil replacement, and the pressure figures used to judge the fuel supply. The coupe's chassis sections carry brake dimensions and suspension geometry, and the diagnostic material ties a symptom the driver reports to the module, circuit and connector that produce it.