The engine B2520 Code is relevant with the car engine and when any error comes from the car engine, any engine code may appear. It is necessary to fix the car engine if you want to drive the car without any problem. Getting the actual meaning of the code is necessary for solving the car engine problem. For the actual meaning of the code, you have to know the manufacturer name and model number what are directly linked with the car engine problem. You can get the information from the car manual. Do not drive the car engine until you get the car fixed.