The engine P1749 Code problem may come for several reasons and you should identify the real meaning of the code to know about the problem of the car engine. The meaning of the code is very important to know about the problem. The automobile dictionary meaning of the code is important and it is p for Powertrain Code Problem is related engine, transmission and emissions systems. 1 for MFG – Manufacturer Specific. 7 for Auxiliary Emission Controls. 4 for BBV Sensor Circuit Low Voltage and 9 for Kick-Down Switch Failed Short. Do not drive the car with the car engine problem or fix the engine problem properly.