Do Passats have the old style key fob with a blade or the new-fangled ones without a key blade ?
The old style ones can get out of synch with the car if you press the buttons too often when you aren't near the car, but owners can resynch the remote (or even add a new remote) themselves, no need for a dealer tool (or VCDS).
The immobiliser chip (or RFID) that lives in the key blade half is a whole different story (VCDS or in some cases dealer only).
Don't know anything about the new fobs without a key blade, sorry.
2017 MY18 Golf R 7.5 Wolfsburg wagon (boring white) delivered 21 Sep 2017, 2008 Octavia vRS wagon 2.0 TFSI 6M (bright yellow), 2006 T5 Transporter van 2.5 TDI 6M (gone but not forgotten).
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