Why want my CAT, OXY sensor reset?

Hello, setting diagnostic monitors is complicated at times -- and other times more simple. I will say - the two monitors you speak of, you really have to have steady driving. Like 55-60 miles per hour on cruise control for 15-20 minutes. Make sure you have 1/4 to 3/4 tank of fuel - in between. And do a couple drives like that. Don't speed up and slow down - stay steady. If you have to stop, start over again. There are several things the engine's computer is looking for, but in my experience -- basically -- that's what I do. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops