2009 BMW 120i Service and Repair Manual

This factory service and repair manual for the 2009 BMW 120i is built on one engine specification: 2.0 liters, 122 cubic inches, four cylinders in line, double overhead camshafts, natural aspiration, gasoline. That unit powers every version in the book — Base, Dynamic, M Sport and Style — in either the two-door or the four-door hatchback body. A single displacement keeps the engine data unambiguous, so a technician reading a clearance or a torque figure never has to work out which variant it belongs to.

Engines covered

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

Body styles covered

• 2-door hatchback
• 4-door hatchback

Trims covered

• Base
• Dynamic
• M Sport
• Style

Known issues on the 2009 120i. The manual's worth is in its detail. Engine sections cover timing, valve train, lubrication, cooling and the fuel and ignition systems, each with the specifications and torque values needed to reassemble correctly. Driveline material continues through the transmission to the rear axle, and the chassis chapters set out brake, steering and suspension service. Wiring diagrams and connector views support the body electrical system across both shells, and the diagnostic sections explain how the control module fault codes are read and interpreted.