Ok reporting back after a short drive, well it appears that the problem is solved now, and yes check engine light is also gone by itself after driving at slow and constant speed, so from the pictures below, exactly 1 box of fuel is remaining and it is showing 100 miles range which is normal, we can say this a success story!
MIL stands for Malfunction Indicator Lamp. The tech may be saying that the OBD II connection is not being established. This can sometimes happen because the connector itself is very infrequently plugged into a scan gauge connector. Sometimes plugging and unplugging a few times will re-establish a good connection. I've seen this happen on a 2004 Honda Civic. I had replaced the upstream oxygen sensor and had to plug and unplug my scanner a few times before making a connection that would allow me to reset the check engine light.
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If coilpacks/sparkplugs are easily accessible, changing them is very easy. I helped a coworker change his Avalon plugs and coil packs and the rears were a bit more time-consuming than the fronts.
If you don't want to do this, yourself, any mechanic at a repair shop should be able to do it. Sometimes dealerships have service specials. Check your local Toyota dealerships for current specials.
Pay no attention to the low life who spew hate and have nothing to contribute.
It's odd how issues like yours occasionally happen. One thing to try is to delete and reinstall the Enform app on your phone. You might even have to delete/add the apps to your Enform account on its website. If all else fails, call Enform support.