When the powertrain of the car engine does not run well, then car engine may become faulty. You should not make delay to check and fix the car engine. When the car engine is checked, the car engine P1154 Code comes. You need to use the real meaning of this engine code. The car engine’s process employs particularly advanced hydraulic lifters what is known as switching roller followers for the P1154 code intake and use valves. The lifters can be warped by disengaging an inner locking pin. The locking pin is severed using solenoids to alter oil compression fed into the lifter.