Voila!
You can monitor STFT (Short Term Fuel Trims) and Open Loop vs. Closed Loop operation with VAG-COM blocks 088 or 099 (they both give the same info):
STFT = Block 088, Field #3: O2 Sensor Control %
OL/CL = Block 088, Field #4: O2 Sensor Control Status
------------------------------------ O2 Reg.OFF = Open Loop
------------------------------------ O2 Reg.ON = Closed Loop
And as reported in a different post, Long Term Fuel Trims are block 032:
LTFT = Block 032, Field #2: O2 Sensor Learning Value @ Part. Load
You can monitor STFT (Short Term Fuel Trims) and Open Loop vs. Closed Loop operation with VAG-COM blocks 088 or 099 (they both give the same info):
STFT = Block 088, Field #3: O2 Sensor Control %
OL/CL = Block 088, Field #4: O2 Sensor Control Status
------------------------------------ O2 Reg.OFF = Open Loop
------------------------------------ O2 Reg.ON = Closed Loop
And as reported in a different post, Long Term Fuel Trims are block 032:
LTFT = Block 032, Field #2: O2 Sensor Learning Value @ Part. Load