The engine P20E1 Code has a dictionary meaning but it is not necessary to use. You should not use the dictionary meaning for solving the car engine but you can use that meaning. The general meaning or the dictionary meaning of the code is P for Powertrain Code Problem is related engine, transmission and emissions systems. 2 for MFG – Manufacturer Specific. 0 for Fuel And Air Metering. E means BBV Sensor Circuit Low Voltage and 1 for TFP Valve Position Switch-Drive Without Drive Ratio. The P20e1 engine code seems a kind of powertrain problem. Deactivation of cylinders is realized by releasing a synchronizer pin that generally interlocks the cam follower and rocker arms.