Removing the cable clamps and cleaning the posts and clamp contact surfaces back to bare metal, then refitting them tight. Static voltage readings afterwards do not prove a low-resistance connection; a loaded voltage-drop test does.
2012 MINI Cooper (R56)
A0A9
A 2012 MINI Cooper R56 no-start complaint investigated with repeated battery tests, terminal cleaning, overnight monitoring, cranking voltage and charging load checks.
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Initial diagnostic: $150 for one primary concern. Additional concerns or complex diagnostic work may require additional time and charges. Standard labor rate: $150 per hour.
Florida MV Registration #MV114761