The definition of the engine B2124 Code is important thing for solving the problem of the car engine. The dictionary meaning is not so important for solving the problem of the engine but it is necessary to know the meaning of the code. The code explains the engine and if you do not know the model and manufacturer name of the code, you cannot solve the problem of the engine. The model number of the code is also important for getting the meaning of the code. Do not drive the car until the problem is solved and after solve the problem take car for test drive.