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I have a factory keyless entry system on my 318is, but sometimes when i press the button on the remote, nothing happens, so i have to manually unlock the door. its obviously the battery in the 10year old remote.

Does anyone know how to change the battery, what type of battery does it take?
 

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:yup Go to your local dealer. They should be able to sell you the battery and pop it in for you at no charge so you'll just have to pay for the battery.
 
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