These instructions apply to the Mazda CX-5 Mk2 (KF) 2017-Present. For other models, please choose your vehicle here.
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Your Mazda CX-5 Mk2 (KF, 2017–present) has Mazda’s i-stop system, which switches the engine off when you stop to save fuel. If you’d rather keep it running in traffic, there’s a dedicated button to turn it off. Here’s how, and why it sometimes won’t cut the engine.
How i-stop Works on the CX-5
i-stop is unusually quick because it restarts by injecting fuel and firing a cylinder rather than just cranking. Brake to a stop (automatic) or stop and select neutral with the clutch up (manual) and the engine shuts off; press the brake/clutch and it restarts. It only operates once the engine is warm and the battery is healthy.
How to Switch It Off
- With the engine running, press the i-stop OFF button — marked “i-stop” with a circular arrow, on the dash near the steering wheel.
- A dash light confirms i-stop is off, and the engine idles normally at a stop.
How to Switch It Back On
Press the button again, or simply restart the car — i-stop defaults back on every time you switch the ignition off and on.
Why It Sometimes Won’t Activate
- The engine isn’t warm yet, or the climate system is demanding strong heating/cooling or demist.
- The battery charge is low — common after short trips or a battery change; i-stop is blocked to protect the battery.
- You’re on a slope, the steering is turned, or you haven’t fully stopped.
If it stopped working after a battery change, let the battery fully charge — see our CX-5 Mk2 battery guide.
Frequently Asked Questions
Does the CX-5 remember my i-stop setting?
No — it resets to on at every start. There’s no built-in option to keep it off.
Is it bad to keep using i-stop?
No — i-stop’s combustion restart is gentle on the starter and battery, and it skips stops when conditions aren’t right.
Why won’t the engine auto-stop?
Most often a cold engine, a low battery, or the climate system demanding the engine.
The i-stop light is flashing — is that a fault?
A flashing i-stop indicator can mean conditions aren’t met or the battery is low; if it persists, have it checked.
If a warning light appeared alongside the fault, look up the code on autodtcs.com. To clear a service reminder, see our CX-5 Mk2 service reset guide.
Disclaimer: The information on this page is provided for general guidance only. Always follow your official service manual and safety precautions when working on your vehicle. We are not responsible for errors, omissions, or any damage resulting from the use of this information.
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