I started working on a Jetta Automatic with numerous errors and heavy fuel consumption (avg 9km/l). After fixing the hardware issues, I scanned it code free.
Took it for a drive, and logged it. I had multiple attempts, but the logger kept crashing for some reason. I only had limited time before the car had to be returned, so not much data is collected.

What I could see was that the MAF was way too high, but I confirmed the mapping to be stock. LTFT is +12%, STFT around 2%. It does not make sense to me that the corrections are positive, since it is overfueling badly.  My other ecu's correct LTFT to negative numbers when rich. The high maf is causing PS_w to go sky high, flooding the cilinders with petrol (injector DC over 100%  ) and also running less timing than optimal.

Just to confirm before spending 150€ on a new MAF: can a defective MAF cause these high readings? I have previously only had them reading low.
The MAF is an OEM bosch wideband model (06A906461L) that matches the car, I checked the sensor inside as well to be sure. After 100km, there where no fault codes present.
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Update: this car has been fitted with a new maf, and was then sold before I could do another log. 
Consumption was still bad according to the owner, but don't know if there was any improvement.
Case closed