Add Oil light after a hard freeze 2004 Journey 39K

[jefflbi]

Seems I can't take a trip without having some sort of issue.......... welcome to camping, right?? Well here's my story. I left home (south Jersey) during some wintery weather. traveling to AL to look at a cabin that is for sale. I used a Harvest Host for an overnight. I drove 8 hours that day no problems other than the weather making the RV and toad very dirty and icing on the windshield. I got to my destination in VA, which also has a 50 amp hookup. It was very cold and that night was the first hard freeze with temps going into the single digits. The next day I started the engine in prep to leave and I noticed on the rear camera on the checklist screen the line that said Engine Maintenance was blinking. Now I didn't have a single issue the day before and I had just had the engine serviced in Dec. I clicked thru all the screens and when it was just rear of the RV on the screen there was a symbol that looked like an oil can with a spout that was blinking. It blinked for maybe 5 minutes then it just stayed steady. During this time I got on the road and drove about 30 miles before stopping to fuel up. I googled the symbol and it's meaning and it appears it means that I need to add oil. While fueling up I checked the engine and trans oil levels and they were right up to the full line as I thought they would be. My mechanic friends say that it's most likely a sensor. My question is where is that sensor and how hard is it to replace??

I want to add that the temps in AL have been cold since I arrived and last night there was another hard freeze and it appears tonight is going to be the same. But starting tomorrow, there is going to be a warming trend and Thursday it is supposed to hit 60. I have started the RV since I got here and I probably will not start it until I leave a week from now.