Autozone will read the codes for free. I think what you have is a bad Oxygen Sensor. If you have the factory warrenty, then they'll change it for free, if not I would defanately pay the 50 bucks and get them to change the 30 dollar O2 sensor.
Mazda 6S, V6, Speed Yellow
5 Speed, Sport package
Bose audio
Painted 'stash and HIDs!
w/Injen 1/4 14.750 @ 94.94
Former car:
99 Contour SE Sport Black MTX V6
SVT plastic...
1/4 - 15.012 @ 90.58