Q: I turn on my 2013 bmw 640i this morning and it just started jerking and shaking then would turn off.

Hello. If you are losing battery power to particular circuits then most of the time this is caused by a bad ground connection, a failing battery cable (https://www.yourmechanic.com/services/battery-cable-replacement), or it may be a bad transmission position sensor (https://www.yourmechanic.com/services/transmission-position-sensor-switch-replacement). It is...

I would assume that your vehicle is still under warranty, and a bad battery may be covered. I recommend checking with the dealership you bought the car at. If you aren't having any trouble starting your car and it is...

Hello - the camshaft position sensor (https://www.yourmechanic.com/article/how-to-replace-a-camshaft-position-sensor-by-mia-bevacqua) is located on the drive-side end of the top of the engine on your vehicle. It is a round black plastic housing - golf-ball size - attached to the engine with one bolt,...

Hi there. The P0449 (https://www.yourmechanic.com/article/p0449-obd-ii-trouble-code-evaporative-emission-control-system-vent-valve-solenoid-circuit-malfunction-by-spencer-clayton) evaporative code is on for either an electrical circuit malfunction to the vent solenoid or the vent solenoid on the emissions circuit has failed. The P0601 (https://www.yourmechanic.com/article/-p0601-obd-ii-trouble-code-internal-control-module-memory-check-sum-error-by-spencer-clayton) code comes on when the computer can no...

If your vehicle is equipped with a sunroof, the sunroof drains may be clogged or the drain hose connection to the body may have come loose. If the drain hose is pulled from the body, water will leak into the...

Hi Conor. Thanks for contacting us today. In most cases, the issue of 'self acceleration' is caused by one of the following; a damaged throttle body, vacuum leak, electronic throttle control, or idle control valve issue. This is a rather...

Hi Bobby. Thanks for contacting us tonight. the Service AWD System light comes on when the ECU detects that there is an issue with the AWD system. When a fault is detected, it creates and stores an OBD-II trouble code...