Hyundai Tiburon O2 sensor, problems at 28,000 miles

Last Thursday, May 22nd, I was on my way to work when my check engine light (CEL) came on. Now, being that this is a fairly new car (at least by my family’s standards) I was immediately worried.
I turned the stereo off, rolled down the windows, and drove like a granny until I rolled into work. My first thought was the gas cap, as I had just filled up. Nope, on tight.
So, I left early to head over to AutoZone. They are able to plug in their OBD-II scanner and read what codes my car’s ECU was throwing.
P0130: O2 sensor, Bank 1 — whatever the hell that meant. So, I’m thinking, is the sensor itself bad, or is it simply reading out of bounds of its settings?
Off to the dealership we go, yay 60K bumper-to-bumper warranty!I got an appointment, and dropped off the car this morning about an hour ago. We shall see what the problem really is.
The pain in the ass about it is that I had to take off the CAI and replace the stock intake — just so they won’t bitch about after market parts. I read over at the hyundai performance forums that people are about 50/50 with their dealers trying to void their warranties, in complete opposition of the Magnuson Moss Warranty Act.
Fingers crossed!