The engine P20C1 Code comes when the car engine has a problem and it does not work properly. The automobile engineer needs to fix the car engine problem for solving the car engine as soon as possible. Do not drive the car until the problem of the car is solved. Read the manual of the car and engine to get information solving the problem. You can understand the meaning of the code if you read the manual of the car engine. The dictionary meaning of the code is easy to understand and it is available online but is not helpful for solving the car engine.