which peugeot engine is it? would be my question... then look for common faults on that unit
The 2014 Mini diesel (typically the 1.5L B37 or 2.0L B47 engine) is generally reliable but commonly suffers from Exhaust Gas Recirculation (EGR) cooler leaks, timing chain stretch, diesel particulate filter (DPF) blockages, and oil leaks.
Check your specific vehicle's service history for strict adherence to oil change intervals, as this dictates the lifespan of the turbocharger and timing chain. To search for open manufacturer recalls or technical service bulletins (TSBs) affecting your vehicle, use the
UK Government Vehicle Recall Check site by entering your registration number.
not the right model but the thoughts are pretty consistent