It happened again yesterday just after leaving work, second day in a row. I stopped at a red light, and since the engine wasn't warmed up enough to auto-stop, I turned the key to"Accessory" or "On"(not sure which) just as I had done the day before to turn the engine off. After restarting, it went to 150mpg and stayed there till another red light when auto-stop engaged and the graph went to "0". After the red light, the graph didn't move, but the MPG continued to rise as if the graph were at 150. At the next red light, I turned the ignition completely off and restarted which fixed the problem. These were the first two times this has ever happened to the car. I have never really turned the engine off at red lights before until recently, so it must have something to do with that.Rick said:Wonder if it's some specific sequence done at start up that no one realizes they're doing.
Greetings Marc,Marc Roberts said:I recent drove a ten mile trip and experienced a false reading on the mpg display. It read only zero or 150mpg, nothing in between. The problem did not appear on the next or any subsequent trip since. Does anyone have any ideas on what caused this?