The P20B3 Code is related with the car engine and for the problem of the engine of the car, the code comes. It is necessary to repair and then the code will not be visible again. The engine code reader finds the problematic area when it failed to check the area and then the code comes for that area. The dictionary meaning of the code is not necessary for solving the car engine. The general/dictionary meaning of the code is found online. You have nothing to worry with this problematic code. You can easily solve the car engine problem if you know how to fix it.