The P20B8 Code has a meaning according to the brand of the car and meaning of the engine code is not similar for all car engines. The definition of the car engine changes by the manufacturer. So, getting the manufacturer and car information is necessary. The dictionary meaning of the code is found online. Meaning of this 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. B for BBV Sensor Circuit Low Voltage and 8 for PCM Stack Overrun. Do not use this car until you get it fixed.