The B2251 Code is necessary thing for solving the car engine and if you want to get the real solution, you should study on the manufacturer’s information. You will get all these information in the manual of the car. However, the general information of the code is not important but it is easy to collect from online and you will get the dictionary/general meaning of the code from many sources. Do not take the car for drive until you fix the car engine problem. The real meaning of the code is important for an engineer for solving the car problem.