How to Repair the Auto Stop/Start on Your R56 MINI Cooper
If your MINI’s Auto Stop/Start system isn’t working and you’re seeing this warning symbol (A with an exclamation mark), the likely culprit is a failed vacuum sensor in the brake servo.
This issue is particularly common on R56 MINI Cooper models. While the warning can seem worrying, the repair is straightforward. The vacuum sensor monitors brake servo pressure to confirm it’s safe to restart the engine. When the sensor fails, the system disables Stop/Start and throws up this warning.
In this video, we show you exactly how to access, test, and replace the sensor — no specialist tools required. It’s a fiddly job, but one you can tackle yourself or book in with us.
Common Symptoms of a Faulty Brake Vacuum Sensor
- Stop/Start warning light (A with exclamation mark)
- Engine doesn’t shut off at traffic lights or junctions
FAQs
- Q: Can I still drive with the warning light?
A: Yes — but your Stop/Start system will remain disabled until the sensor is replaced. - Q: Where is the sensor located?
A: It’s located behind the engine, connected to the brake servo. Awkward to reach, but accessible with basic tools. - Q: Do I need to reset anything after replacement?
A: No reset needed — once the sensor is replaced, the system will re-enable automatically after a short drive.