The C1209 Code is the engine code and engine area of the car should be fixed. The valves of individual cylinder are closed using a pair of arms that replace the conventional engine’s roller-type rocker arm. The engine C1209 code is one of these arms follows the cam profile while the second arm connects to the valves. During normal engine operation the two arms are joined by a locking pin. You can know the general meaning of the code but that meaning of the code is not very helpful for solving the car engine. You need to have necessary information and tools for solving the car engine problem.