P0171 code

What is your question?

I have been having this problem for a while now, My 2016 Hyundai Sonata check engine light came on while I was driving, it turned out it was a P0171 code, My local mechanic could not find anything wrong with it, and recommended I take it to a dealership. I went to two dealerships and they both recommended I get new fuel injectors, so I got new ones and I thought the problem was fixed, but after about 600 miles the check engine light came back on. I have spent a lot of money and I am not sure what I should do, my local mechanic wonders if its a programming issue but I do not know what that means, the car had its engine replaced, could this have something to do with it? I am pretty sure it is not an easy fix because I have now had three experts look at it. Please Help!

What makes this problem better or worse?

Car runs fine, I would not notice anything wrong if the check engine light was not on

How long has your 2016 Hyundai Sonata had this problem?

a few months