The P0066 Code is relevant of the car engine and meaning of the code is necessary to know. For solving the car engine, no parts or components should be substituted with position to only a P0066 DTC. The bus service manual should be checked for more information on conceivable sources of the fault and compulsory testing. The valves of individual cylinder are saved shut using a pair of arms that trade the conventional engine’s roller-type rocker arm. The engine P0066 code is one of these arms what follows the cam profile while the 2nd arm connects to the regulators. Throughout the normal engine process the two arms are combined by a locking pin.