The B1515 Code definition is important thing for resolve the engine issue. You cannot solve the problem in your home or in your place if you do not have all necessary contents and machineries. It seems that the problem of the engine started from body of engine. It is not easy to fix if the correct meaning of the code. Due to the model and manufacturer of the car, the meaning of the code changes. Read the manual what will help you to identify the problem and solve the problem sooner. You should also need to know the dictionary meaning of the code for solving the issue.