DIY – Replacing BMW Comfort Access Key FOB Battery

Hey Everyone,

Thought I’d share a short DIY for those with late year BMWs that came with the comfort access feature.  For those that are not famaliar, comfort access with BMW allows you to open/lock doors with the key in your pocket, and also (prior to becoming standard on current BMWs) allowed for starting the car without placing the key FOB into the slot next to the steering wheel.



I haven’t found many instructions on how to go about replacing the battery for this type of FOB – and there are lot of myths/discussions on forums about whether the cars with comfortable access have rechargeable batteries — which are recharged via the slot in the ignition for the car.

I’m here to tell you — they are not rechargeable batteries – at least on vehicles like the E90 / E92 3 series generation with comfort access option from the factory.

Let’s get on with it — here are the simple steps to replacing the battery.




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