The dictionary meaning of the B1993 Code is b for Body Code Problem is antilock brake system, electronic suspension and steering systems. 1 for MFG – Manufacturer Specific. 9 for Fuel and Air Metering. 9 for Crankshaft Position Sensor Circuit Performance and 3 for Transmission Control Module Reprogrammable Memory. The real meaning of the code is found from the manual of the manufacturer. The manufacturer set the meaning of the code and if the code meaning is unknown according to the manufacturer, you cannot solve the car engine problem. So, you need to know all necessary information for solving the car engine.