Read the meaning of the engine P0864 Code before starting the process of solving the car engine. The car engine’s problem is very serious and problem can be more serious if you drive the car with the engine problem. Do not use automobile dictionary meaning of the code for solving the car engine’s problem. You may use this meaning of the code later when you have no better option for solving the car engine. Find the meaning of the code what is from the manufacturer of the car. Once the car engine is ok, you can drive the car but a test drive is recommended first.