The dictionary meaning of the B1878 Code is known general meaning and it is not all for solving the problem from the car engine. It is found that the code is set on the car engine and if you want to know the real meaning, you have to depend on the manual of the car. The code you may find in many car engines but all meanings are not same. According to the car model, the manufacturer change the meaning of the code. If you find the manual of the car, you will get some information there what help you to know the problem.