The B1253 Code has several meanings what is connected with the model and manufacturer. You need to fix the problem of engine and you may take help form professional. If you have all necessary instruments, then you may try to solve the problem. The problem of the engine is related with body of engine. For solving the problem, you do not need to use anything if you hand over the engine to the experts. If you have tools and you know how to fix the engine. You need to read the manual properly for solving the problem of the engine.