The engine C1704 Code comes on the engine code reader screen and getting the real meaning of the code is necessary to solve the car engine problem. Do not use any meaning of the code for solving the car engine problem, it may divert you to wrong way to solve the car engine and you gain more problem in the car engine. The valves of individual cylinder are reserved locked by a pair of arms that change the straight engine’s roller-type rocker arm. The engine C1704 code is one of these arms what follows the cam profile while the 2nd arm joins to the valves. Through the normal engine operation the 2 arms are linked by a locking pin.