These instructions apply to the SEAT Arona Mk1 (KJ7) 2018-present.
For other models, please choose your vehicle here.
Your SEAT Arona (KJ7, 2018–present) shuts the engine off at a standstill to save fuel. When you’d rather it didn’t — crawling traffic, a hot day, or before any under-bonnet work — one button switches it off. The auto stop-start light (an “A” circled by an arrow) is not a fault: it simply shows the fuel-saving function is active and ready to cut the engine when you stop.
How Start/Stop Works on the Arona
When you come to a halt and hold the brake, the control unit checks a set of conditions and, if they’re all met, stops the engine. Lift off the brake (auto gearbox) or dip the clutch (manual) and it fires straight back up. The system leans on the 12 V battery to restart quickly, so it constantly monitors battery charge, engine and cabin temperature, and how much the heater or air-con is working. If any of those aren’t happy, it simply won’t stop — that’s the system protecting itself, not a breakdown.
Getting Ready
- You can press the button with the ignition on — the engine does not need to be running.
- Look for the AⓇ symbol on or near the button so you press the right one.
- Decide before you set off: the setting only lasts the current drive.
- If you’re about to work in the engine bay, switch it off first so the engine can’t restart on its own.
Turning Start/Stop Off
- Locate the AⓇ button (an “A” circled by an arrow), usually near the gear lever.
- Press it once; the indicator confirms the system is off and the engine stays running at stops.
Why It’s On Again Next Time
The Arona switches Start/Stop back on at every ignition cycle — there’s no permanent off from the factory. Tap the button once at the start of each drive if you don’t want it.
If the Engine Won’t Cut (or the Button Won’t Disable It)
Reasons you might still see the engine idling with the system switched on, or the off setting seeming to do nothing:
- Weak or ageing 12 V battery — the most common cause. A tired battery, or lots of short trips that never fully recharge it, stops the system engaging.
- Cabin not at temperature — on a cold or very hot day it keeps running to heat or cool the interior.
- Engine still warming up — it usually won’t stop until the engine is up to temperature.
- On a slope — it may decline to stop on a gradient.
- Steering or brake input — turning the wheel or not holding the brake firmly can keep it running.
- You pressed the wrong control — check the indicator changed state when you pressed AⓇ.
What Happens Next
With Start/Stop switched off, the engine keeps idling at every stop for the rest of that drive and the button’s indicator stays lit to confirm it. Next time you start the car it will be armed again by default. If a dedicated fault symbol appears rather than the normal status light, that’s worth looking into — it usually points at the 12 V battery.
Frequently Asked Questions
How do I switch off auto stop/start on a SEAT Arona?
With the ignition on, press the AⓇ button near the gear lever. The indicator changes to show the system is off, and the engine will stay running the next time you stop. It stays disabled for the current drive only.
Can it stay off for good?
Not from the factory settings. The Arona re-arms Start/Stop every time you switch on the ignition, so there is no permanent off. The practical routine is to press the button once at the start of each drive if you prefer to keep the engine running at stops.
Why did it switch itself back on?
Cycling the ignition resets the system to its default on state. This is by design, not a fault. Even if you pressed the button last time, a fresh start clears that choice, so you’ll need to press it again on your next journey.
Why won’t the engine cut at a standstill sometimes?
The system only stops the engine when its conditions are met: a healthy 12 V battery, a warm engine, satisfied cabin heating or cooling, level ground and a firm brake pedal. If any is missing — commonly a low battery or a cold cabin — it keeps running, which is normal behaviour.
Is it bad to leave Start/Stop running?
No. The engine and starter are designed for the extra cycles, and the system already refuses to stop when the battery is weak or the engine is cold. Leaving it on saves a little fuel in town. Switching it off is simply a comfort or convenience choice.
Does turning it off harm the battery or engine?
No. Disabling Start/Stop just means the engine idles normally at stops, exactly as an older car would. It has no negative effect on the battery or engine — if anything the battery sees slightly less demand because it isn’t supporting repeated restarts.
If a start/stop fault symbol shows, it usually points to a weak 12 V battery — see our Arona battery guide, or look the code up on autodtcs.com.
Independent guide — not affiliated with SEAT. Always follow your official service manual and safety precautions. Read our full disclaimer.