The B1321 Code is connected with the car engine problem and this problem is not good sign for the car owner. It is necessary to solve the problem of the engine if he wants to run the car without any trouble. The meaning of the code can be dissimilar car to car, model to model. From the dictionary meaning of the code, it is found that the problem has started from the body of the engine. For this purposes, you do not need to change the parts of the engine. You can easily solve the issue if you have all important instruments. If you do not have all expensive machineries, you should take the car to the auto repair center.