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How do you program the key of the Mazda 3 after replacing the battery?

Model: Mazda 3 MK 4, BP - Years 2019-2026
Part: Key

If the battery of your car key/remote runs out, it can happen, including the Mazda 3 mentioned here. In case this causes the decoding, you must remedy it by reprogramming the key, and for this reason, we have a video available here that explains how to do it: you need to connect a professional electronic programming device to the car's ECU, via an OBD socket, using suitable cables, configure the program according to the vehicle, and when requested, bring the key close to the Start button. In a few minutes, the job is done, and we will have confirmation of the successful outcome by trying to turn on the instrument panel.

Posted on 8 November 2025 by ScegliAuto

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