2021 MINI Cooper S Electric Level 1 Electric · CB03 TKB

The defining mechanical story of this 2021 MINI Cooper S Electric Level 1 is one of broadly stable roadworthiness punctuated by a single, easily resolved failure and a cluster of recent tyre-related advisories. Across four recorded tests spanning 2024 to 2026, the vehicle has passed on three occasions with no defects recorded, most recently on 7 July 2026. The only outright failure occurred on 7 June 2024, caused by a split nearside front wiper blade failing to clear the windscreen effectively and a nearside headlamp aim that was set too high, both of which are routine, non-structural items easily rectified before the vehicle returned to the same test centre later that same day and passed without advisories. The 2026 test introduced three advisory notices, all concerning tyre condition: slight damage to the nearside front tyre, and cracking or perishing on both rear tyres. None of these advisories constitute a failure, but the simultaneous appearance of perishing on both rear tyres warrants careful attention, as dual-sided deterioration can indicate ageing rubber rather than isolated impact damage. Against the backdrop of a five-year-old vehicle, the recorded mileage of 20,688 miles is notably low, equating to an average annual accumulation of roughly 4,138 miles. This figure is significantly below the typical mileage band for a car of this age and suggests either genuinely limited use or extended periods of inactivity. The testing pattern aligns with this interpretation, as the vehicle has appeared for MOT testing each year since first eligibility in 2024 with no significant gaps in the record. For an electric vehicle, low mileage combined with possible standing periods carries specific implications: brake discs and pads may be susceptible to surface corrosion due to reliance on regenerative braking limiting friction pad application, while 12V auxiliary batteries and high-voltage battery conditioning routines benefit from regular use. Tyre sidewall perishing, as flagged in the latest test, is also consistent with low-mileage standing, where prolonged static exposure to UV and temperature cycles accelerates rubber degradation even where tread depth remains adequate. A prospective buyer should treat the rear tyre perishing advisories as a priority inspection point. Both rear tyres should be examined closely for sidewall cracking, checking whether the fissures are superficial or penetrate deeper into the rubber structure, as tyres exhibiting significant perishing will require replacement regardless of remaining tread. The nearside front tyre should similarly be inspected for the nature and location of the recorded damage, distinguishing between sidewall impact bruising and minor tread cuts. On a test drive, listen for any irregular road noise that could indicate uneven tyre wear or alignment issues, and check for steering pull or vibration through the wheel, which can accompany mismatched or damaged tyre conditions. Given the low-mileage profile, it is also prudent to verify brake disc condition by raising the vehicle or requesting a visual inspection, looking for any lipping or rust pitting on the disc surfaces that might indicate prolonged standing rather than wear from use. Beyond the flagged items, the single 2024 headlamp aim failure and wiper blade split should be considered closed matters, as both were remedied before the same-day re-test and did not recur in subsequent examinations. However, the low annual mileage context means a buyer should still probe for symptoms of inactivity-related wear elsewhere. On a test drive, listen for any clonks or knocking from the suspension over uneven surfaces, which could point to seized components from standing rather than mileage-driven wear, and verify that the steering feels consistently weighted without excess play. Check the operation of all electrical systems, particularly cabin heating and air conditioning, as these are commonly under-exercised in low-use vehicles. Finally, confirm the date stamp on any existing tyres, as the combined effect of low mileage and visible perishing strongly suggests the current set may have been fitted several years ago and could be due for replacement irrespective of legal tread depth.