Go into measuring blocks under the Heating & AC controller in VCDS & it will show you the pressure in the high side of the system, if it has some then a recharge will probably get it up & running, if none then there will have been a leak.
Beware, I think that VCDS shows absolute & not guage pressure (hopefully someone will confirm) so 1bar would be zero pressure. - Confirmed by Rosstech link.
I have just been out checking mine, seems like the slow leak I had has healed up or I screwed up on the initial charge and the 2 subseqent recharges.
Buying an AC manifold test set (£30ish) is a good investment and will tell you a lot of whats going on internally, VCDS will tell you lots of whats going on extarnally, temperatures, flap positions, shut off codes, PWM current delivered to N280 modulating valve etc, with both you have the full picture, some study needed regarding high & low side pressures, ambient temps etc.
https://forums.ross-tech.com/showthread.php?633-Tis%92-the-HVAC-Season