radio codes
 

Hello all i hope someone can help or at least point me in the right direction. I have a 2000 GPSE when i got the car itdid not have the factory radio in it. The used dealer gave me a used one to put in and low and behold i forgot the code i put in it. To tell you the truth i'm not sure ifthis radio come from another GP or not. I read that needed to hold two presets down and some lock code would pull up,, well the presets i hold down are the numbers 2 and 3 and it pops up a number 292 and 298 i tried both those numbers and it still goes to "loc" and after three times it goes into "inop". Can someone please help!!