The B1247 Code is a fault code of an engine and by the B1247 code, it is very simple to identify the problem. However, if the problem is important to solve, then read the manual as well as know the manufacturer and model of the car. The B1247 Code comes for the body problem of the engine and for this reason, you do not need to change any component of the engine. The oxygen of two sensors on your car quantity the oxygen in the finish to determine how rich or thin the ratio of fuel and air are in the cylinders. Enhancing this combination means fewer exhaust emissions and better fuel economy.