I just got my 2nd hand E46 318i CKD yesterday.During my trip back from the owner's house, the aicond was cold as I am using 1 of the key which the owner is using.The key already spoil on the BMW button meaning that cannot lock but can unlock therefore I try the spare key which also abit faulty.The spare key is more terrible as using the spare key the car aircond did not work. Just to ask advised from all the sifu in BMW forum. Does the key affected aircond?