The B1841 Code is found from the car engine code reader and if you do not solve the problem from the engine, the code does not disappear from the car code reader. This code comes when the code reader fails to test the B1841 Code area. This code is found in all of the popular cars but meaning of the code is not same. The meaning of the code is possible to know when the manufacturer name and model number is known and these are found from the manual of the car. You have nothing to worry if you have already taken the car to the automobile repair center.