Check engine light

I've kept my 13 HS in a heated garage (55-60 degrees) over the winter and have never had a check engine light come on after starting it. I recently moved the bike to my home garage (not heated) and almost every time I start the bike when it is cold (30-40 degrees), the check engine light comes on and off until I've ridden the bike for a couple of miles. When it comes on, the engine still has normal power and it runs and sounds fine. I've checked my coolant and oil levels and everything is fine. It sucks that I have to run the bike all the way up to the dealer to get this diagnosed but I was just putting this out there in case there is anyone out there who experienced a similar symptom and had any ideas of something I could check myself. My first thought was that the there was a coolant level sensor that was causing the light due to the bike now being in a colder environment and the coolant level might be just barely covering the sensor until it warmed up and the fluid expanded, but I can't see a level sensor on my reservoir. My coolant level is roughly 1 inch below the MAX level mark.

Dropped it off tonight at a dealer. Keeping fingers crossed it is something simple since the bike still runs like a champ.

Dealer called and said they "think" its a lambda sensor but they won't be sure until they order it and put it on. Shipping could take up to 10 days. Hope this works because I have my first road trip planned in a few weeks.