The engine P0279 Code lets you know the problem of the car engine and by the proper solution of the car engine, it is possible to solve the car engine. There are some symptoms what you need to test and analysis the car engine for finding the car engine problem. These symptoms are decreased engine performance and increased fuel consumption. If the problem of the engine is not solved, then new problem may trigger. Those problems are fuel injection control module (FICM) failure, fuel injector failure, powertrain Control Module (PCM) failure and wiring issue. After solving the car engine, you should drive the car as a test purpose.