The B2120 Code is generally associated with the car engine and it is not possible to solve the problem by everyone as the code comes from the engine. The engine reader shows the code when it is failed to check the area the B2120 area from the engine. The problem of the code should be solved by an expert and it is necessary to use expensive machines. Do not need to use any component as alternative of any device. The code explains the problem of the engine and it is important thing to solve the issue. The real meaning of the code is necessary to identify the problem.