System too lean Bank 1 p0171 Audi a4 1.6 ALZ

[Pennypacker]

Hi.

I've ran into a problem on my Audi A4 B6 1.6 litre ALZ.

It keeps throwing the P0171 code during load. Been looking around for vacuum leaks but can't spot any guilty parties and that it's happening during load makes me suspect fuel pressure or MAF sensor.

I connected my pc to an adapter and ran a log on VCDS-Lite to gather some data. Note it did not throw the code during this testrun.

Sorry for the length of the log:)

https://docs.google.com/spreadsheets...45&single=true

At timestamp 262 i peaked it in 3rd on hot engine.

At timestamp 105 i peaked it in 3rd on semicold engine.

Anyone have any ideas as what can eliminate where the problem lies ?
Any help and tips would be appreciated greatly.

[old guy]

I think you may have a bad MAF sensor. I don't see any flow above 52 g/s even when you are over 5,500 rpm. That sounds pretty inadequate. It should be closer to 80 g/s for the ALZ engine.