The general meaning of the P20CD Code is not helpful but if you are interested, you can study about the meaning of the code. In general, you will get general/dictionary and manufacturer meaning as well as the manufacturer meanings are available as different meanings. Do not use general meaning. You need to use the manufacturer meaning according to your car engine. The general meaning is available online and for the manufacturer meaning is found from automobile manual. Do not drive the car with the problem. You should try to solve the car engine problem if you have ability for solving the problem.