I was driving down a mountain road today and my check engine light came on at the same time as my electronic throttle control system light. I drove to the nearest auto parts store and got the code read. P2181 and P0441. The first is an engine coolant temperature error, the second is an Evaporative Emission Control System incorrect purge flow error. I've cleared the code to see if any of the errors come back. nothing so far but I've only driven it 10 miles. I find these errors confusing because they all seem to be coming from different seemingly unrelated systems. Can anyone explain to me why these warning lights and codes occurred together? or offer advice on how to diagnose the problem that needs solving. The only thing I've done so far is to check the gas cap seal which I've heard can cause the purge flow error, it looks fine. The car seems to be driving fine although the idle is a little high and erratic, but that has been going on for a half a year now and the dealer couldn't tell me what was wrong.