You need to fix the car engine if you want to drive the car and the engine P0412 Code helps in this case. Do not allow wrong meaning of the code what will drive you to wrong path. Do not allow any meaning of the code like automobile dictionary meaning. The automobile dictionary meaning of the provides general information only and this meaning of the code is not right for your car engine. You need to find the cause of the engine problem and you should check all symptoms for finding the real cause of the car engine problem. Always, a test drive is suggested.