Big Un' good for another 60k

About 3 years ago I had one of my impulse moments; bought our Grand Wagoneer right after they were introduced unable to help myself. I love the older ones from the 80s/90s.. and they were back! Kicker is I bought it sight unseen. Never been in one, never drove one. Got online, put in my wish list and ... up the street in Bonham they had one ... paid list price, traded in our Porsche Macan on it and ... never looked back. Three Years old / 61k miles Left MS yesterday back to Tejas and after some crazy rain, the 'check engine' light was on. Did some search on the reasons for it, and felt confident enough to head home 550 miles. My gut feeling was correct, and no issues home except that damned light on the dash glaring back at me. This morning, headed to the dealership and .. the light goes off. Crap. That's good and bad. Good for obvious reasons bad because it's harder to diagnose the actual problem....