How can I activate Fastag which is already pre-installed on my new car?

If a vehicle already has an RFID tag, it might already be activated. When you buy the vehicle, RFID tag payment was also done. It might also have a minimum balance of INR 100 or 200 as is required by the bank.
You can recharge it with your Customer ID or Wallet ID of FASTag. These details are available in the email or mobile number provided by you at the time when you bought your vehicle.

The main providers of FASTag are HDFC, ICICI & Axis bank. The payment can be done using normal payment methods such as bank transfer, net banking, cards.

For example, check the below video to see how to recharge an Axis bank linked FASTag.

You can also reach out to the helpline number of your FASTag linked bank if there are any technical issues.