With any problem of the car engine, you should not drive and take step for solving the car engine. The car engine should be checked and the car engine P2181 Code has come up on the car engine coder reader screen for the test. An automobile engineer can fix the car engine and the valves of the each cylinder are remained closed by using a pair of arms what replace the straight engine’s roller-type rocker arm. The engine P2181 code is one of these arms what 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.