This engine U1074 Code is found in many car engines and if the right meaning of the code is found, it becomes useful for solving the car engine problem. The valves of individual cylinder are remained closed using a pair of arms that swap the conventional engine’s roller-type rocker arm. The engine U1074 code one of these arms follows the cam profile while the 2nd arm connects to the valves. During normal engine operation the 2 arms are linked by a locking pin. Do not drive the car with any problem if the car engine has any problem. Take the car for a test drive.