i'm looking at a 330d 002 face lift

ive a feeling something is not right,so is there anyway i can check the cars system to see if everything is working ok,i seen on youtube you can reset the service light,engine management light etc all in a couple of seconds.

http://www.youtube.com/watch?v=2K8AF-vuL8E

please can someone tell me how to stop yself from becoming a mug!!!