Do I have to go through customs when I transfer from T2E to T3 at Paris Charles de Gaulle Airport?

First of all, you have to go through the customs, that is, you enter Schengen from 2E, and you don't need to enter the customs when you transfer at T3. Because I have entered Schengen, I just need to take care of my luggage and change my boarding pass. If you fly from China to Paris, and Paris to Barcelona, even the baggage check-in time will be saved. If you print your boarding pass in advance, you only need to check in and board at T3.

Secondly, you should have no problem, or have plenty of time, unless your luggage is left at home by the flight? 2E, after getting off, follow the instructions to 2F and T 1 3, and then transfer to the light rail.