The automobile dictionary meaning of the car engine P1911 Code is found online and it is p for Powertrain Code Problem is related engine, transmission and emissions systems. 1 for MFG – Manufacturer Specific. 9 for Fuel And Air Metering or Injector Circuit Malfunctions Only. 1 for Low Coolant Circuit and 1 for TFP Valve Position Switch-Drive Without Drive Ratio. You must not use this meaning of the code for solving the car engine problem first. You should try to solve the car engine problem by the real meaning and if the real meaning of the code is not found, you may use general meaning of the code.