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Mayor of London

Card clash

If you touch your Oyster card on a yellow card reader when it's in the same wallet or purse as another contactless card, the reader may detect more than one card. When this happens, the card reader doesn't know which one to read.This means:

  • It doesn't know which card to take payment from
  • If you get a green light it could take payment from a card that you did not intend to pay with
  • If you get a red light it means you won't have paid for your journey
  • If you are at a ticket gate, it may not open
  • If you are at a station, you could be charged two maximum fares for your journey. This happens when a reader charges one card when you touch in and another card when you touch out   

Only touch one card on the reader when touching in and out to avoid paying with a card you did not intend to pay with.

Check for card clash

Sign in to your online account to make sure that the card that you intended to pay with has been charged for the journeys you have made. If you also have a contactless payment card, you should check the journey history on that too, to see if there are any unexpected journeys on that.If you have been charged a maximum fare on two separate cards for the same journey, you can apply for a refund by signing in to your online account.

If you have been charged a fare on a card you did not intend to pay with, please contact our Customer Services team on 0343 222 1234 (TfL call charges).