Apologies for bringing up a relatively old post, but did any get a definitive answer on this? Bought a new car (for us) recently, and replaced both batteries on the keys as the message came up. Only about 3 months later and its showing again! This is a 65 plate Leon. Have to pop into the local Seat
Garage for a Boot Latch part anyway, so may ask them about his as well. I didn't even check if I was still in warranty but knowing me it won't be!