So I have had this issue two times recently and I'm curious if anyone else has experienced it or may know what is going on or where to start. I haven't had time to get the codes read but that is on the list for later this week. I'm in Southeast PA so we have the "Winter Blend" gas. Expy sat 8+ hours while at work or overnight and the temperature has risen considerably from about freezing (30 degrees) to 50-60 degrees. When starting, the wrench comes up on the display. Started first time, no issues there and ran normally. Since the code came up, I shut it down and restarted. Upon restarting and thereafter, no wrench. Ran normally, no issues. First time may have been with a full tank. Second time was with half a tank. Any ideas? This only happened twice so far, similar conditions with the ambient temperatures with a large warm up in temperatures. I'm thinking emissions/evap/sensor issues. 07 Expy with about 193000 on it.