An automobile engine check the car engine when it is working swiftly. The engine P1798 Code is found from the car engine after the test. The code is meaningful and it helps to solve the car engine problem. Alike the all car engines, this car engine process services particularly advanced hydraulic lifters what is known as switching roller followers for the engine P1798 code intake and use valves. The lifters can be collapsed by undoing an internal locking pin. The locking pin is disconnected using solenoids to change oil pressure fed into the lifter. Do not fix the car engine by wrong meaning of the code.