Check your terminal before departing; Terminals 2 and 3 share a station

https://marioabpg472.image-perth.org/getting-to-heathrow-by-tube-piccadilly-line-tips-times-and-luggage-advice-3

Check your terminal before departing; Terminals 2 and 3 share a station, while Terminals 4 and 5 have their own dedicated rail stops on the tube and Elizabeth line.