The B1440 Code defines an error of the engine. This code has a meaning and that is B for Body Code Problem is antilock brake system, electronic suspension and steering systems. 1 for MFG – Manufacturer Specific. 4 for Transmission. 4 for BBV Sensor Circuit Low Voltage. 0 for Transmission Engaged at High Throttle Angle. From the definition, it is found that the problem of engine is associated with the body of engine. The oxygen sensors on your car identify the oxygen in the use to define how rich or lean the ratio of fuel and air are in the cylinders. Enhancing this mix means better fuel economy and less exhaust discharges.