ZX2 Codes

Hey, My mother in-law just bought a 99 ZX2 and its running a bit rough, took it to auto zone to get the codes checked. they came up with P1506, P1131, and P0171. Cant find the description for P1506 or P1131 on the net, I havent looked to in depth but im kind of in a hurry to get this thing fixed. I have pretty limited time home. Can someone tell me what these codes are and the possible fix. Thanks

Try this website should tell you what you need to know. http://www.troublecodes.net/OBD2/Pcodes.shtml

Thanks