Real meaning of the B2128 Code is necessary and you will get the meaning of the from the manual and from the automobile dictionary. You have to read the manual to get the model number and manufacturer name of the car where the problem exists. Manufacture of the car sets the code and it is necessary to know. The code is also set according to the model number of the car. The dictionary meaning of the code explains general meaning of the code. However, you have nothing to worry if you already transferred the car to experts and after test drive bring the car from automobile center.