I hope folks don't mind the frequent updates, but, I just can't seem to help it... So, while waiting for the part (purge valve) to arrive, I took the vehicle home in order to continue familiarizing myself with all the controls and screens, etc... The service folks said it would be OK to drive with the check engine light on, with the caveat that the gas engine may not operate as efficiently as it should. OK, I can live with that. After driving for about a week, I was still getting in excess of 45mpg... Anyway, driving in to work this morning, I noticed that the check engine light had gone out (on it's own apparently). This begs the questions: do I really need the replacement purge valve (still on-order); and, how long do I wait before deciding that it's no longer needed? i.e.: until the light does/doesn't come back on? I just love waiting for something to NOT happen.... As an IT guy (information technology / computer geek) I'm beginning to wonder if the old joke about computers with Microsoft Windows, you know the one, "if it hangs, just re-boot it", is now going to apply to cars with Microsoft Sync built in :-) Just re-start it a couple of times, and it'll go away...