This engine P1864 Code is an important thing and by the meaning of the code, you can know about the problem of the car engine. An automobile engineer will check the car engine and find the cause of the car engine. He will check the car engine by the symptoms and the car engine should be fixed properly. The car engine should checked Fuel Temperature Sensor B Circuit Range or Performance, Cylinder 4 Contribution/Balance Fault and Ignition Coil A Primary/Secondary Circuit Malfunction. When he found the car engine’s problem, he must fix the car engine properly. Everything should done by an expert automobile engineer.