"So it’s done" shows technically interested new and used car owners how their vehicle works and which maintenance and repair tasks they can perform themselves. The 138th volume of the series contains instructions for maintenance and repair of the BMW 3 Series E90 from 3/2005 to 1/2012. Over 500 illustrations depict the individual work steps. Troubleshooting tables assist in diagnosing faults. Wiring diagrams allow for quick identification of errors in the electrical system and aid in the subsequent installation of electrical accessories. Here you will find information about repairs related to the car: vehicle maintenance, instrumentation, braking system, lighting system, windshield wiper system, heating/air conditioning, vehicle care, exhaust system, transmission, clutch, axles, chassis, steering, wheels and tires, bodywork, interior, engine management, and engine mechanics.