I will try a different dealer. Yes, the light comes on at least every 400 miles. I did have one flash upgrade and I recently received a recall notice for my O2 sensorso when I go in I will make sure everything is up to date . The truck is a 2007. I love it love it love it except for this little bug and a bug that shifts me almost into redline when coasting downgrade when I am in tow/haul mode towing my orange friend...sadly I only have one...so I count you a lucky man! although I am getting a dozer next week so am pretty excited! have a good one! -C