The dictionary meaning of the P20B9 Code is found online and you can learn the dictionary meaning to know some common information. The dictionary meaning of the code is not important thing for solving the car engine problem but you can study. Read the manual of the car engine and you will get some general information about the car engine. Do not follow the dictionary meaning for solving the car engine. You need to get the genuine meaning of the code and it will get in the manual of the car engine. Do not drive the car with the faulty engine.