Posable bad door switch. How old is the battery? Minis are know to do odd things when the battery is going bad. Have it load tested at your local parts store.
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Welcome to Motoring Alliance !! MCS02 gave you a good starting point. If you are able to do your own troubleshooting/maintenance repairs a Bentley manual can be a very helpful asset. Good luck with your repairs and let us know what the final was.
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You said that you were having the problem after the car had been sitting a day or longer. There is a good chance it is your battery. Another possibility is the safety interlock (clutch switch for manual transmission or brake switch for auto transmission), but my first guess is the battery. -
Dave.0 Helix & RMW PoweredLifetime Supporter
Battery
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Last week I got the triangle with the ! inside it for the first time on my '13 Justa. I stopped by my dealership and even though everything appeared to be working fine they showed me where the battery was one step from being dead. Problem solved via warranty.