first off do a ecu power latch first off as link below, after clear all fault codes,
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also fully charge the battery that can have a effect

how to reset ecu,s power latch or power down for mini...
How to reset all ecu's this procedure is called a power latch firstly turn on the ignition not engine running,IE FOB IN DASH SLOT, TOUCH BUTTON UNTIL SEE DASH LIGHTS ON IE FUEL GAUGES ETC THIS IS IGNITION ON, THEN FOR IGNITION OFF TOUCH BUTTON ONCE THIS SWITCHES THE IGNITION OFF IE SAME...