The fault code B1431 appears for the engine’s error. The meaning of the code changes based on the manufacture and model of the car. Read the manual before starting solving the problem of the code B1431. The code defines that problem is related with the body of the engine and that is B code has appeared. The oxygen sensors on your car count the oxygen in the finish to control how rich or thin the ratio of fuel and air are in the cylinders. Enhancing this combination is better fuel consumption and fewer exhaust emissions. It is necessary to know the dictionary meaning.