Catalytic converter sensor is this a Subaru cost covered recall?

What is your question?

Took my Impreza in to the Subaru dealer for an oil change and asked them to reset the check engine light - one of my children had recently borrowed it and actually put gas in it so I thought it was a loose gas cap issue but was told that I need a new front sensor and possibly a rear one, too, they could not be sure. I bought the car new and have always had all service done at the dealership as scheduled so I am a bit concerned that I wasn't informed about this recall. This is not an inexpensive repair, especially if it is for 2 of them - is Subaru suppose to foot this bill?