Diagnostic HELP please.

[kb03gt]

B6 A4 1.8t
Code p0171
New fuel pump and filter
Sai removal/simplified vac (after code existed)
Boost leak check ok.
New maf

New suspect: 02 sensor

https://youtu.be/UJUzZFL4G1g

I'm pretty sure I've hurt the engine at this point but I need to figure this out. Bought the car with the code and thought I could do this simply. I'm honestly at a loss. I haven't ordered vcds yet but I'm going to because this is killing me know the inside. Any insight would be appreciated.

[Seerlah]

Easy fix. You just need to locate your vacuum leak and address it, if there is one. Could also be caused by a faulty MAF. You need to log your g/s to see how the MAF is doing. What many do is order the torque app and purchase a cheap bluetooth obd2 reader. Well worth the $10 it will cost you said and done. I have the maestro suite and still use the tq app. For price point reasons, I suggest you go this route for time being. Pay for the full version app.