2006 Elantra fuel system question
 

I've got a 2006 Elantra with just over 60k miles. Its ran great since I bought it new a few years ago until just the other morning when the check engine light came on. I checked all the easy things to make sure the car was still safe to drive, and I took it down to Autozone to get the codes read. I've got a repeating P2195 (O2 sensor stuck Lean) and P0170 (Fuel trim to rich or lean). My local Hyundai dealer won't talk to me without bringing the car in for diagnostics which will cost around $75, which will be credited back to me if I decide to have them fix whatever is wrong with the car. I guess my question is if anyone out there has had fuel system related work done on their Elantra, and if so what ball park I'm looking at in terms of overall cost to repair. I'm planning on calling around to a few local mechanics as well, not just my local dealership, but I'm sure I'm not the only one hurting right now with the economy, and I just want to know what I might be getting into. Any help or opinions would be greatly appreciated. Thanks!