2021 BMW 120i Service and Repair Manual

This factory service and repair manual for the 2021 BMW 120i is arranged by system for one specification of car: the four-door sedan, M Sport trim, with the turbocharged 2.0L inline-four of 122 cubic inches under the hood — twin cams, gasoline, forced induction. Because nothing in the range varies, the specification tables carry no alternates and the wiring diagrams describe exactly one build, which shortens the path from a symptom on the road to the procedure that addresses it.

Engines covered

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

Body styles covered

• 4-door sedan

Trims covered

• M Sport

Known issues on the 2021 120i. This model year comes through the federal record clean, without a recall and without a single owner complaint. The manual's value is therefore in its coverage: engine overhaul and management procedures for the turbocharged 2.0L four, fuel, boost, ignition and cooling service, transmission and driveline work, and brake, steering and suspension specifications with torque values. The body sections give repair data for the sedan shell, and wiring diagrams with diagnostic routines cover its electrical systems.