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Mini Mini
MOT 2023
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Mini

Mini

364,542 MOT tests analysed. runs below the UK fleet average — here's where Minis pass, fail, and end up on the retest sheet.

That's 6.4 points below the UK fleet average across our 1,988 tracked models — buyers should expect more first-time fails than the typical UK car.

Pass

69.3%

Pass-after-fix

5.9%

Fail

23.9%

Avg miles

89,194

Pass + Pass-after-fix + Fail = 100%

The picture

MINI's 69% Pass Rate Among the Worst in Class

Just 69.3% of MINIs pass their MOT first time — one of the lowest rates in any mainstream segment. Lamp failures and cracked windscreens lead the failure categories, but owners' real headaches run deeper. Timing chain failures on R56 Cooper S units have landed bills of around £1,900, and porous cylinder heads have been reported as early as 57,000 miles. One MINI specialist admitted they had never seen the condition before.

At an average test mileage of 89,194, these cars have typically covered enough miles for known mechanical issues to be well established. Budget for timing chain inspection on any turbocharged petrol, and ask specifically about coil pack and cylinder head history before buying.

Top ten reasons for rejection.

  1. 01

    A rear registration plate lamp or light source missing or inoperative in the case of multiple lamps or light sources

    20,379 occurrences · 5.6% of tests

  2. 02

    Windscreen or window damaged or seriously discoloured but not adversely affecting driver's view

    17,596 occurrences · 4.8% of tests

  3. 03

    A lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning

    16,603 occurrences · 4.6% of tests

  4. 04

    Headlamp reflector or lens slightly defective

    12,010 occurrences · 3.3% of tests

  5. 05

    Tyre tread depth not in accordance with the requirements

    9,455 occurrences · 2.6% of tests

  6. 06

    The aim of a headlamp is not within limits laid down in the requirements

    9,352 occurrences · 2.6% of tests

  7. 07

    Brake pipe damaged or excessively corroded

    9,199 occurrences · 2.5% of tests

  8. 08

    A suspension pin, bush or joint excessively worn

    9,028 occurrences · 2.5% of tests

  9. 09

    A transmission shaft constant velocity joint boot severely deteriorated

    8,486 occurrences · 2.3% of tests

  10. 10

    Lambda coefficient outside the default limits or the range specified by the manufacturer

    8,020 occurrences · 2.2% of tests

Counts cover Major and Dangerous defects logged at test. Advisory items excluded so this shows why a car was rejected, not just what the tester flagged in passing.

Worst-case fix budget · top 3 failures

£78–£210

If every one of this Mini's most-logged Major fails hit at the same MOT, that's the real-world UK garage range. Reality is usually one or two items, not all of them. Open the estimator →

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Build your own retest budget.

Tools that pre-empt a retest.

Picked against this car's top failure patterns. Affiliate links to Amazon UK — we earn a small cut at no cost to you. Disclosed up-front, doesn't shape the data.

Item 01 · Amazon UK

H7 / W21W bulb pack

A spare-bulb kit lives in the boot. Test morning is not the time to find your stop-lamp's gone.

Search Amazon UK

Item 02 · Amazon UK

Headlight restoration kit

Yellowed lenses fail the light-output test. A restoration kit lifts the haze in an afternoon for £20.

Search Amazon UK

Item 03 · Amazon UK

Digital tyre-tread depth gauge

Five quid for a gauge beats £150 for a retest. UK MOT minimum is 1.6mm — most testers fail anything below 2mm to be safe.

Search Amazon UK

Owner reports · Honest John

What owners actually report.

Verbatim faults logged by owners on honestjohn.co.uk over recent years. We didn't summarise — these are the words people typed in.

What's good

17-inch wheels with Sport suspension destroy both ride and road feel, air conditioning wasn't standard on models before January 2009.

Recent owner-reported faults

  1. 20 Dec 2016

    Porous cylinder head reported on 2008 MINI Cooper at 57,000 miles. Car has cost £3,000 in repairs over past 3 years. MINI specialist said never saw the condition before and that car needs a new engine. BMW MINI dealer to conduct diagnostic tests for a manufacturing fault.

  2. 18 Oct 2016

    Yellow engine EML light came on in 59k mile R56 MINI Cooper S. Garage advised that it needs a new timing chain (which has "jumped a tooth") and a few other parts. Estimated cost £1,900, of which parts are about £1,500, but apparently the replacement parts would not develop the same problem later (ie, the parts have been modified to eliminate (or reduce) this problem).

  3. 11 Aug 2016

    Report of 17,400 mile 2012 MINI Cooper auto with Pepper pack perpetually stalling and losing power to steering and brakes. Taken to MINI dealer which has had the car for 12 days and cannot find the problem. (Begs the question why not. See above.)

  4. 24 Jul 2016

    65,000 mile 2009 R57 MINI convertible automatic reported to be using a litre of oil every 1,500 miles.

  5. 20 May 2016

    As directly above (9-5-2016), engine warning light recently came on in 25k mile 2011 MINI Cooper. Fault was traced to a failed solenoid in the sump, resulting in oil tracking back up the wiring to the engine management system, all of which had to be replaced. MINI and the local MINI dealership dealt with the situation very well. MINI stood the cost of the new EMU, and the dealer significantly reduced his hourly rate. Instead of a bill of £1,800, the reader paid £526. The dealer told him that it was a rare, but not unknown problem. Somewhat friendlier dealer than 9-5-2016.

  6. 9 May 2016

    Starting problem on December 2010 MINI Cooper S Cabriolet traced to failed oil seal on a solenoid that allowed oil to track along the wiring harness and into the engine management system, both of which had to be replaced, along with re-programming. BMW dealer response was no chance of a contribution to repair costs on a car of that age. Owner opted to have it repaired at local independent MINI specialist. This cost £2,525.

  7. 9 Jan 2016

    Timing chain failed on used 2009 MINI Cooper S bought 3 months previously.

  8. 16 Nov 2015

    Rear brake discs of 3 year old 30,000 mile MINI Cooper corroded and MINI lease demanded they were replaced by lessee before returning the car.

  9. 3 Aug 2015

    Strange case of 3 year old MINI Cooper S failing to start after a recent franchised service. Local mechanic found that CV joint had detached from driveshaft.

  10. 21 Jul 2015

    Number of problems reported with Cooper S. First, a timing chain failure (often the result of too infrequent oil changes). MINI provided goodwill. Then a coolant leak from a failed header tank (£600), and now another coolant leak at the seal with the oil filter for which the dealer is asking another £600. This could be connected with the electric pump that circulates coolant through the turbo and which was the subject of an NHTSA recall in the USA.

  11. 11 Jul 2015

    Report of peeling and blistering of clearcoat lacquer on Chilli Red MINI Cooper S.

  12. 29 Sep 2014

    Another yellow engine light showing on a 2007 MINI Cooper S. Suspect oil/timing chain problems.

Source: honestjohn.co.uk · 30 reports indexed, top 12 shown

Buying or keeping a Mini?

Use the failure ranking as a pre-test checklist or a haggling lever. Treat the headline pass rate as a fleet-wide trend, not a guarantee on any individual car.

If you own a Mini and your last MOT looked nothing like the ranked failures above, that's normal — individual cars vary widely. The ranking shows the patterns testers flag most often across the country.