I doubt that this is it, but I'd check it anyway before taking it to the stealership. Check the hoses in front of the gas tank, right above the rear differential. They usually throw a different code (for a gross evap leak). But I think mine may have thrown that code also when I had one with a leak in it. They are rubber lines and they dry out and split on LOT's of KJ's. There are some that are ony a short 4 or 5" connector. I replaced mine for about $5 and had enough hose left to relocate my diff breather to the gas cap door.
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2003 Liberty Sport 4X4
DIY Frankie Lift, BBS Rims, Aussie Locker Rear, DTT Front, Renegade Rack & Light Bar, Custom Front Bumper w/ Warn XD9000i, Custom Rear Bumper, JBA UCA's, Full Skids(Mopar, Kilby and Super skid), CRS Rock Rails, CB, EVIC, Nav, power dim mirror, (2) 8" subs under front seats.
http://www.cardomain.com/ride/2512777