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If your 2018 BMW 330i key fob has stopped working or has a weak signal, the battery is likely dead. Instead of going to a dealership and paying for a replacement, you can easily swap out the battery yourself in just a few minutes.
This guide will walk you through the step-by-step process of opening the key fob, replacing the battery, and reassembling it correctly. The process is simple, requires only a small flathead screwdriver, and will help you restore full key fob functionality.
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Press the small button on the back of the key fob to release the mechanical key.
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Pull the key out completely.
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Insert the mechanical key into the slot and gently twist it to pry open the key fob case.
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Carefully remove the old CR2450 battery by lifting it out with a nylon spudger or your fingernail.
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Place the new CR2450 battery in the correct orientation, with the positive (+) side facing up.
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Ensure the battery is properly seated in the battery slot.
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Align the two halves of the key fob and press them firmly together until you hear a click.
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Slide the mechanical key back into the key fob until it locks into place.
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Press the lock/unlock buttons to ensure the key fob is working.
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.
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York University, Team 3-11, Woodhouse Winter 2025 crwdns2935289:0York University, Team 3-11, Woodhouse Winter 2025crwdne2935289:0
YORK-WOODHOUSE-W25S3G11
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