The general meaning of the P20C7 Code is not necessary to use for solving the car engine problem but if you want to learn something then you can use it. It is suggested to collect real meaning of the code what you will get the manual of the car and read it for getting the manufacturer meaning of the code. You may need to read the car engine manual for getting more information about the code. Different car manufacturers set different meanings of the code and for this reason, the meaning of the code does not remain same. So, getting the right meaning of the code is necessary to solve the problem.