Jhill

Honestly these are very reliable cars and fuel trim codes shouldnt be hard for a competent tech to diagnose. If you don’t have vehicle knowledge then it is time to stay clear of the autozones, free scan diag shops etc. all they will be doing is getting the code and throwing parts at it, which you have already done yourself. Time to take it to a real shop, maybe one that is gold shield certified for emissions repairs (not sure if that applies in your area) as these are the shops that have to actually fix cars once all the parts changers are done and throw their hands up.

Good luck, as I said it shouldn’t be hard for a competent tech to diagnose fuel trim issues but sadly those are getting harder and harder to find as the industry keeps pushing them out. Once you find one keep him, possibly even his personal number if he isnt the shop owner, in case he quits. All the shops and dealers seem to forget it’s the techs that make the shop/dealer not the other way around and they only recognize it after people start quitting and their reviews tank.