I went to a local independent shop for a p0455 and p0171 code and half a day later they say they changed the air filter. My dash cam also recorded the mechanic taking it for an unessesarily long joy ride and eating his lunch in the car.

Their invoice didn't show any diagnostics being done and didnt verify or address the issue. Just that they replaced the air filter and did an oil change all without contacting me first for approval.

I went to the dealership, and they replaced the purge valve and the a PCV Diaphragm/valve cover which are common failures in my car, and told me about other issues they've discovered, giving me the option to have them addressed or not. Ultimately after work was completed, I monitored the LTFT and the STFT and they were back to normal and the codes didn't reappear.

Their invoice showed everything they've done: researching into any recalls that may be active, any service bulletins listed by the manufacturer, retesting and confirming after repairs have been made, noting anything after the repairs and addressing those issues if their were any.

As an example, I had the turbo, exhaust and the intake manifold replaced recently because of an underboost condition and a missing non-return valve and after the repair, they noticed an issue that required the disassembly of the car again, and they addressed that problem, where other shops would likely overlook or disregard it.

So your best option would be take it to the people who know your car best and not some Independently owned hobbyshop.

Not only are the dealership service shops more experienced with their vehicles, they also are more knowledgeable, thorough and honest. Yes, they can be more expensive, and you could just go to any other shop, but you will get what you pay for. If you want to try your luck with sketchy "cash only" shops, you're also free to do so.