Well, for a little over the past week, my truck has been showing the "Drive to Clean Exhaust" display as soon as I start the truck, but even if I drive it for about 20-30 minutes during the cleaning cycle, the next time I get in the truck and turn it on, almost immediately the "Drive to Clean Exhaust" comes back on. Took my truck to the dealership Friday, and it's going into the shop Monday for them to look at it. Its a 2011 with 27,000 miles. Also, another reason that I think that something might be screwed up is my mileage. I have been getting about 13 on the highway, its on 35" Toyo M/t's with the 3.31 gears, but my step dads truck is a long bed, on 37" Toyo M/T's with 3.55's and around town he gets about 14.5. Anybody else had this problem? What did they find wrong?