The B1574 Code has various meanings but you do not need to know all meanings. For getting the correct meaning for your car, you have to know the model and manufacturer. The B1574 code displays that location the body attach connector, positioned in and about the left-hand kick panel area or inside the IP. Water can leak into the link from stopped sunroof drains, A-pillar leaks, or windshield or cowling leaks. After solving the problem of the engine, you should take the car for test drive. Still, you have found problem, you need to take the car to the auto repair center.