<prompt> Human: Just thought Id share a minor success story I had this weekend. I recently just bought a new car. An 08 Passat 2.0T. It was stuttering when I was leaning hard on the gas and then the check engine light started flashing. Turns out it was misfiring. I just bought this OBD II reader on Amazon to help diagnose the problem.The scanner read P0303 Misfire in cylinder 3. I looked this up online on some VW forums and turns out the ignition coils are a notorious problem area and that its a pretty easy DIY fix. Local shop wanted 400 to fix robbery. I fixed it myself for 70 and now my car runs perfectly. It just felt good to fix it myself and not get bent over by a shop. Best 16 I spent in a long time!  <response>: Basic car maintenance is one of those things that has the potential to save you a ton! I have an 02 Ford Taurus and the AC went out. The shop said that I had a blown AC blend door actuator, and that it would be a minimum 400 just to see if thats what the problem was. The official maintenance guide said you need to fully disassemble the dash to get to the problem, so with labor costs, 400 min. My Taurus has automatic AC control, including a built-in self diagnostic tool. Turns out, the actuator wasnt blown, the car forgot what position it was in after the battery was replaced. The blend door was stuck in the position blowing as hot air as it could. The diagnostic tool reset it and boom, cold air again.If I had taken it to that same shop, easily 500 to fix what wasnt actually broken. 