The engine P1558 Code is an important thing and this code tells about the car engine problem. The valves of individual cylinder are kept locked using a pair of arms that substitute the conventional engine’s roller-type rocker arm. The engine P1558 code is one of these arms what follows the cam profile while the 2nd arm attaches to the valves. During the normal engine process the 2 arms are joined by a locking pin. The oxygen sensors on the car degree the oxygen in the usage to control how rich or lean the ratio of fuel and air are in the cylinders. Enhancing this combination means improved fuel budget and fewer use releases.