2012 BMW 320i Service and Repair Manual

This factory service and repair manual for the 2012 BMW 320i marks the switch to forced induction in this model line: a turbocharged 2.0-liter inline-four of 122 cubic inches with double overhead camshafts, gasoline, in a four-door sedan sold in Base trim. A turbocharged four asks different things of a technician than a naturally aspirated six did, from charge-air plumbing and boost control to wastegate and oil-feed work, and those systems are documented here with their own specifications and diagnostic routines.

Engines covered

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

Body styles covered

• 4-door sedan

Trims covered

• Base

Known issues on the 2012 320i. Three recalls stand on the federal record. Two of them concern the vacuum pump that provides brake assistance: insufficient lubrication can make the pump fail, and a related fault in its lines and fittings has the same result, leaving the driver with a hard pedal and reduced braking power. The third covers side marker lights that may not illuminate, making the car harder to see at night. Owners have logged three complaints, two on the air bags and one on the electrical system, and brake, lighting and restraint diagnostics all sit in this manual.