The B1821 Code has general meaning but it is necessary to know the manufacturer and model. You need fix the car problem if you want to drive the car without any problem. You should not try to solve the problem in your place if you do not have all necessary tools and experience. That is why, you should take the car to the professional place. It is found that the problem of the engine is started from the body of the engine and it is very easy to solve. So, you can solve the problem of the engine at minimum rate.