The engine P0774 Code is found in the car engine and real meaning of the code helps for solving the car engine problem. If you do not know the real meaning of the code, you cannot solve the car engine. You need to fix the car engine properly and you can fix the engine like the car engines, this automobile engine system services expressly developed hydraulic lifters what is known as switching roller followers for the engine P0774 code intake and exhaust valves. The lifters can be misshapen by disengaging an internal locking pin. The locking pin is detached using solenoids to modify oil compression fed into the lifter.