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Issues Causing the i-stop Warning Light to Illuminate on Mazda 3

Model: Mazda 3 MK 4, BP - Years: 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026
Part: Checks and maintenance

Video tutorial

In this video, we will look at the issues that can cause the "i-stop" warning light to illuminate on a Mazda 3. If the light is steady, there may be suboptimal conditions for activation, such as the air conditioning being on, or the battery charge is not optimal.

Keep in mind that an open door, unfastened seatbelts, or the steering wheel turned to the maximum can also prevent the component from functioning.

If the light is flashing, it could indicate a problem with the 12V battery being discharged or degraded: AGM batteries typically last 2 to 3 years, and symptoms include slow starting and other dashboard warnings. It could also be a faulty alternator or sensor, meaning the alternator may not be charging the battery correctly; this issue could arise for the auxiliary battery in models that have one. In these two cases, we need to check the battery charge, which should be between 13.8 and 14.4 with the engine running.

If you replace the battery, you should drive for about half an hour to allow the ECU to recalibrate.


Posted on 9 March 2026 by ScegliAuto


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