Hi,
The first thing to confirm is that the correct size tires were used. They must be the same size as the two you kept.
If they put two different size tires on the vehicle, that certainly will cause 4wd problems. Also, there is a chance that the wheel speed sensor may have been damaged or disconnected when the tires were removed and replaced. That will turn the light on for you.
I attached a pic below showing the wheel speed sensor's location behind the wheel. Check that wire I highlighted and make sure it is connected and not damaged.
Let me know what you find or if you have other questions.
Take care and God Bless,
Joe
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Monday, March 15th, 2021 AT 7:48 PM