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How to Replace the Key Battery on a Toyota Prius

Model: Toyota Prius MK 1 - Years 2004-2009
Part: Key

If the key for your first generation Toyota Prius (2004-2009) has suddenly stopped working due to a flat battery, don't worry. This guide will explain how to replace it easily. First, remove the emergency key, then unscrew all four small screws using a small cross-head screwdriver and take off the battery cover. Finally, remove the old battery and replace it with a new one of the same model, then reassemble the key correctly.

Updated on 13 August 2026 by ScegliAuto

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