Meaning of the B2157 Code can be known from online and it is called general meaning but it is not suitable for solving the problem. The real meaning of the code is associated with the brand of the car. Different brands set different meanings of the code and you will get the code in different cars’ engines. That is why, meaning of the code is not similar for all car engines. The basic meaning of the code is same for all of the car engines. The basic meaning gives you general idea about the problem. Body of the engine has the main problem and it is easy to solve.