Some Pointers can be found with
@Yohoki 's TempAR App. But it all depends on the Game you are trying it on. There are some where it just wont work, or only work for a Limited Time.
Example:
Urban Trial Freestyle - Challenge Mode - Infinite Fuel Code works perfectly. No matter if you let the Intro Video run or not, and also if it is the first time running, or if you have used it before.
LEGO Star Wars - The Force Awakens
Tried making Max Studs, and Infinite Health Codes. I got it for the 1st few Levels, but once it got to the 2nd Act where you play as Rey, it stopped working.