2018 Kia Optima — check-engine light turned itself off — still scan it?

I'd want a measurement, not a hunch. A pressure test beats staring at a dry driveway if the 2018 Kia Optima is losing coolant with no puddle. If the cheap test changes it, stop and reassess. Verbal 'we'll take care of it' is not a plan. Heat soak after errands is the other window.

This is usually cheaper to test than to guess. Capture voltage while the 2018 Kia Optima is actually failing — after it restarts you've lost the clue. You'll know quickly if you're on the wrong tree. Had a similar mess a couple years ago and that's what finally sorted it. Make the next action something you can finish this week. No warning lights, which is why I'm documenting it.

Log the conditions before you spend. A pressure test beats staring at a dry driveway if the 2018 Kia Optima is losing coolant with no puddle. If the cheap test changes it, stop and reassess. On “check-engine light turned itself off — still,” that was the fork that mattered for me. Have you gotten a second quote in writing? Climate here is different, so treat that as a local data point. I already checked the easy fluid levels.

Start with the test that can prove you wrong. Swap the cheap/easy piece first on the 2018 Kia Optima and see if the fault moves. If the cheap test changes it, stop and reassess. Had a similar mess a couple years ago and that's what finally sorted it. I'm keeping receipts and dates in one folder.

OP update: scanned the 2018 Kia Optima again and still only have the one pending code, no new lights. Doing the boring step first on purpose.