The engine P1221 Code helps to fix the car engine problem and it is necessary thing. The meaning of the code lets you know about the problem and meaning of the code must be real meaning. However, you can use automobile dictionary meaning of the code and it is p for Powertrain Code Problem is related engine, transmission and emissions systems. 1 for MFG – Manufacturer Specific. 2 for Accelerator Pedal Position (APP) Sensor 1 Performance. 2 for Air Conditioning (A/C) Clutch Feedback Circuit High Voltage and 1 for TFP Valve Position Switch-Drive Without Drive Ratio. Do not allow this meaning until you get the right meaning of the code.