2012 BMW 135i Service and Repair Manual

This factory service and repair manual for the 2012 BMW 135i lists two trims, Base and M Sport, across a two-door convertible and a two-door coupe, all with the turbocharged 3.0L DOHC inline-six. Nothing in the engine changes between them, so the differences show up in chassis settings, seating and trim hardware and in the wiring that serves the added equipment. Engine, driveline and chassis procedures each keep their own sections, with alignment and torque specifications given where the two trims diverge.

Engines covered

• 3.0L inline-six — DOHC, turbocharged, gasoline

Body styles covered

• 2-door convertible
• 2-door coupe

Trims covered

• Base
• M Sport

Known issues on the 2012 135i. The federal record carries six recalls for this model year. A rear driveshaft constant velocity joint that can fatigue and break, taking drive with it, is the most consequential. Two cover driver's air bag inflators that can rupture on deployment; another covers a blower-regulator harness whose connectors can overheat and melt into a fire; the remaining pair concern engine housing bolts working loose and a loss of electrical power, either of which can stall the car. Nineteen complaints are logged, across the power train, engine and air bags.