The engine P0109 Code is very important thing and for solving the car engine, real meaning of the code is necessary along with some machines are necessary. Do not try to fix the car engine if you do not know how to fix and what are the causes of the engine problem. You need to use expensive tools for diagnosis the car engine. By the symptoms, it is possible to know the car engine problem easily. You need to know about the car engine problem. Do not drive the car with any problem in the engine, Finally, a test drive is recommended.