I know that replacement and recoding of a complete key costs quite a bit, but what about replacement of the key battery? My key went diving with me today in a friends undersuit (i.e. it didn't get wet, or subjected to much pressure - we were only at 3m all dive!), but now it won't remotely lock or open the car. It will however manually work the locks and the car starts/runs ok with it in the ignition, suggesting that the coding chip is ok. I wonder if it may be the battery (as when the suit compresses, it may have pushed all the buttons at once??). I have a spare key anyway, so not a complete disaster, but would like to get this sorted..