Used car guide

2009 MINI ONE: common problems and what to check

What gets flagged at MOT on 2009 MINI ONEs, from 343 tests in 2025, plus known faults and what to look at before you buy one.

Small sample: only 343 of these were MOT tested in 2025, so treat the percentages as rough. The known faults below don't depend on it.

343MOT tests in 2025
52%pass first time (all 2009 cars: 58%)
5,200typical miles a year
13.6×the usual rate for exhaust emissions (catalyst)

What stands out

Parts flagged at MOT more often on 2009 MINI ONEs than on all cars registered in 2009.

  • Exhaust emissions (catalyst)13.6× usual
    MINI ONE
    25.9% All 2009 cars
    1.9%

    Failed outright at MOT: 25.1%, against 1.8% of all 2009 cars. The rest were advisories or minor defects.

    Rough price £175–£900 (catalytic converter) ClickMechanic

    At the viewing: Look for smoke when revving the warm engine and for engine or DPF warning lights.

  • Sidelights2.2× usual
    MINI ONE
    15.5% All 2009 cars
    7.2%

    Failed outright at MOT: 9.9%, against 6.3% of all 2009 cars. The rest were advisories or minor defects.

    Rough price £10–£80 our estimate

    At the viewing: Ask a friend to check every light while you work the switches: indicators, brake lights, fog lights and reversing lights.

  • Sub-frame2× usual
    MINI ONE
    15.2% All 2009 cars
    7.7%

    Failed outright at MOT: 0.3%, against 0.4% of all 2009 cars. The rest were advisories or minor defects.

    Rough price £300–£1,000 our estimate

    At the viewing: Look underneath at the frame the suspension bolts to. Flaky rust or holes are expensive to fix.

Better than most

Coil springs: 6.1% here, against 12.4% of all 2009 cars.

By area

The share of 2009 MINI ONE MOT tests where testers flagged each area, as a fail or an advisory. Rough prices are typical independent-garage costs.

  • Tyres
    33% of testsRough price £70–£150

    At the viewing: Check the tread on all four tyres, including the inside edges, and look for cracks or bulges.

  • Lights and electrics
    32% of testsRough price £10–£80

    At the viewing: Ask a friend to check every light, including brake lights and indicators, while you operate them.

  • Exhaust and emissions
    32% of testsRough price £100–£1,200

    At the viewing: Look for black soot in the tailpipe, listen for blowing from the exhaust and check for engine or DPF warning lights.

  • Suspension
    30% of testsRough price £120–£400

    At the viewing: Listen for knocks over speed bumps, and look behind each front wheel for a snapped coil spring.

  • Brakes
    29% of testsRough price £150–£350

    At the viewing: Look for a lip on the disc edges and feel for judder or pulling when braking firmly from about 40mph.

  • Oil and fluid leaks
    16% of testsRough price £80–£600

    At the viewing: Look under the engine and on the ground where the car is usually parked for fresh oil or fluid.

Known faults

Reported by owners, mechanics and buying guides for this model and age. Check which engine the car has, as some apply to one engine only.

  • Timing chain rattle (petrol)
    Petrol

    Worn timing chains and guides are a known costly repair on these petrol engines, often from low oil levels.

    At the viewing: Ask the seller not to warm the engine before you arrive. A rattle on a cold start is a warning sign.

    Source: Parkers: MINI hatch buying guide

  • Turbo wear (Cooper S)
    Turbo petrol models

    High oil use can wear the turbo quickly on turbo petrol models.

    At the viewing: Once warm, rev it hard and look for blue smoke or a burning oil smell.

    Source: Parkers: MINI hatch buying guide

  • Worn water pump

    A whistle at idle that goes when you blip the throttle usually means the water pump is worn.

    At the viewing: Listen at tickover once the engine is warm.

    If it needs doing: Water pump, about £115–£375. ClickMechanic

    Source: Parkers: MINI hatch buying guide

Looking at a MINI ONE?

Check the actual car: its own MOT history, mileage and what to ask the seller. Free, no sign-up.

Other years

YearMOT testsMost flagged
20221,208Tyres 28%
20211,313Tyres 29%
20201,138Tyres 30%
20191,556Tyres 32%
20181,568Tyres 30%
20175,366Tyres 32%
20168,296Tyres 31%
201510,360Tyres 31%
20146,152Tyres 31%
20137,001Tyres 32%
20124,267Tyres 32%
20111,045Tyres 34%
2010599Tyres 33%
2008290Brakes 39%
2007252Lights and electrics 38%
2006183Brakes 52%
2005196Brakes 55%
2004134Brakes 57%

Where this comes from: the DVSA's anonymised results for every MOT test in Great Britain in 2025, counting tests of 2009 MINI ONEs registered in 2009. "Flagged" includes advisories, so it isn't the same as a fail rate. How we score