Steps to update your Vehicle Registration No.: 1. Login to Kotak FASTag portal - https://www.fastag.kotak.com 2. Click on “Vehicle Number Update” tab on the left hand side menu. 3. Upload Registration Copy in PDF file (size should be less than 5MB) and Vehicle Image, click on Submit. Within 3 working days your Vehicle Registration Number (VRN) will be updated. In case you face any issue while uploading details on Kotak FASTag portal please write to fastag.support@kotak.com from your registered email id along with dully filled and signed FASTag Maintenance Form. Attach scanned copy of your PAN card and Registration copy. Link for Maintenance Form: https://www.kotak.com/content/dam/Kotak/Customer-Service/Download-Forms/Personal-Banking/fastag/fastag-maintenence-form.pdf