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Stock Problems/IssuesDiscussions related to warranty related issues and repairs, or other problems with the OEM parts and software for MINI Clubman (R55), Cooper and Cooper S(R56), and Cabrio (R57).
High pressure fuel pump is my guess. If the car doesn’t see the correct pressure at the fuel rail, it will cut power because it thinks the fuel supply can’t match demand. Sounds like the only thing you haven’t touched...