Before experiencing any serious problem in the car engine, you need to fix the car engine and for this reason, you should get the meaning of the engine P0678 Code. When you seek the meaning of the code, you must use the name of the car and manufacturer’s name. Read the manual of the car engine to get the real meaning of the code. The automobile dictionary meaning of the code is easily find online and you will get that for free. You can get some general information from the automobile dictionary and you do not need to use for fixing the car engine.