Why is the message so brief now? I took the truck into the dealer last year for an "upgrade" to the computer system. The previous upgrade had the "Cleaning Exhaust System" message lit up for the duration of the cleaning. Now it only comes on for about 3 seconds and then disappears. I complained to the dealer that I never know when the thing in going through a cleaning and he just shrugged. It seems that Ford has taken a step backward with this programming upgrade.