SEAT Mii MOT Pass Rate & Official DVSA Failure Statistics

SEAT Mii MOT History and Failure Rates vs UK National Average

The SEAT Mii passed on its first attempt in 83.1%, and its overall record sits +4.4 percentage points above the national average for all cars. These figures come from every recorded DVSA MOT test for the SEAT Mii in the 2023–2025 data: 62,831 tests across 10 model years (2012–2021). A test still carries exactly one pass or fail verdict.

Figures are computed from every recorded DVSA test for this model in the 2023–2025 data.

Most Common SEAT Mii MOT Problems by Failure Category

Every MOT failure a tester records belongs to one inspection section of the DVSA manual. For the SEAT Mii, the Visibility section leads the record — the breakdown below shows where the recorded failures cluster, then the exact strings behind the three biggest sections.

Shares are over the SEAT Mii's recorded defect strings, merged across its year pages.

Top Recorded SEAT Mii DVSA MOT Test Statistics & Defect Descriptions

The descriptions below are the exact DVSA failure strings testers recorded most often for the SEAT Mii, each with how many of the model's 62,831 tests it was noted on.

• "Service brake performance excessively binding" (Major) — noted on about 1,194 SEAT Mii tests, 1.9% of the model's MOT record.
• "Windscreen damaged but not adversely affecting driver's view" (Minor) — noted on about 1,010 SEAT Mii tests, 1.6% of the model's MOT record.
• "Pins and bushes pin or bush excessively worn" (Major) — noted on about 618 SEAT Mii tests, 1.0% of the model's MOT record.
• "Fuel cap/sealing device ineffective" (Major) — noted on about 609 SEAT Mii tests, 1.0% of the model's MOT record.
• "Position lamp not working" (Rectified) — noted on about 569 SEAT Mii tests, 0.9% of the model's MOT record.
• "Tread depth below requirements of 1.6mm" (Major) — noted on about 559 SEAT Mii tests, 0.9% of the model's MOT record.

Best and Worst SEAT Mii Model Years by Pass Rate

The strongest SEAT Mii model year on record is 2019 (92.4% across 4,148 tests), and the weakest is 2012 (81.6%). The gap between them is 10.8 points. Years with fewer than 50 recorded tests are excluded, so these are the years with enough MOT history to mean something.

SEAT Mii reliability is improving in the DVSA data — the pass rate moves about 1.1 points a year across the most recent model years shown above.

Newest model year first. Only years with at least 50 recorded tests are listed.

Pre-MOT Inspection Checklist for SEAT Mii Owners

These checks follow this SEAT Mii's own most-recorded failure strings, starting with what a tester is most likely to flag on a SEAT Mii.

• the windscreen — “windscreen damaged”

  Check the driver’s side of the screen within the swept area for chips and cracks; anything larger than 10mm in the driver’s central view is a fail. Most chips can be resin-repaired for far less than a new screen.

• the suspension joints — “pins and bushes pin or bush excessively worn”

  With the car parked on level ground, rock the top of each front wheel in and out while someone watches the suspension arm. Clunks, or rubber boots split and greasy, are what testers record here.

• the lights — “position lamp not working”

  Switch everything on and walk round the car: both headlamps on dip and main, every indicator, both brake lights, reverse, fog and the two number-plate lamps. A bulb is a few pounds and a five-minute job.

Derived from the DVSA failure strings testers recorded for the SEAT Mii. A check that finds nothing means the item is likely fine, not that the test is guaranteed.

Where the SEAT Mii is most common

Across every Mii model year on record (2012–2021): 25,282 SEAT Mii cars tested in a recordable postcode area, across 62,830 tests. Sheffield (S) has the most, with 686 cars tested there. Cars are counted by the postcode area of the MOT station, so this is where they were tested, not necessarily where their owners live.

The twenty areas with the most SEAT Mii cars in the record, sorted by car count — sort the columns for a different question. Cars tested at a station whose postcode area could not be resolved are counted in the model's total but in no area, so the shares add up to slightly under 100% even across every area, and an area's cars are a subset of the model's. Pass rate is blank below 30 tests in an area, where a percentage is noise rather than a finding. How this model's pass rate varies by postcode →

Frequently Asked Questions: SEAT Mii MOT & Reliability