2012 BMW 128i Service and Repair Manual

This factory service and repair manual for the 2012 BMW 128i covers the two-door convertible and the two-door coupe in Base trim, both fitted with the naturally aspirated 3.0L DOHC inline-six. One engine across two bodies keeps the mechanical sections compact, and the space goes instead into electrical and body material — the roof mechanism and its switching on the convertible, the lighting and comfort circuits on both — each with the wiring diagrams needed to follow a fault from the fuse through to the load.

Engines covered

• 3.0L inline-six — DOHC, naturally aspirated, gasoline

Body styles covered

• 2-door convertible
• 2-door coupe

Trims covered

• Base

Known issues on the 2012 128i. Five recalls are recorded for this model year. Two concern driver's air bag inflators that can rupture when they fire and send metal fragments into the cabin. Another covers the blower-regulator wiring harness, where overheated connectors can melt and start a fire in an unattended car; one more covers a loss of electrical power that can stall the car without warning; and the last covers a crankcase ventilation valve heater that can short and overheat. Of 31 complaints logged, 23 name air bags, with a few on the engine and its cooling.