Just got my first Lupo Gti(02) yesterday..... One key is fine, the other doesn't operate the central locking. I have changed the battery, re-syncronised the key(expert at doing this on my mums Golf) but nothing. The key will open the door manually and start the engine, but wont switch off alarm. Any ideas?? Is there only one battery in the key?? The Golf keys have two, but thats a 98!