SEAT Mii: MOT pass rate and reliability data

The SEAT Mii passes its MOT first time more often than the average UK car, by 5.4 percentage points. These figures come from the DVSA's full year of anonymised MOT results, covering 17,534 individual SEAT Mii tests. Nothing here is an estimate or a survey.

The numbers

First-time pass rate82.1%
UK national average76.7%
Difference+5.4 points
Tests analysed17,534
Average mileage at test51,748 miles
Average year of manufacture2015
Reliability rank1,373 of 2,005 models

What this means if you are buying one

A 82.1% first-time pass rate means roughly 18 in every 100 SEAT Miis presented for MOT fail on the first attempt. That is better than average, so a well-kept example is a reasonably safe used buy. The average SEAT Mii tested had covered 51,748 miles and was built around 2015.

What this means at salvage auction

Pass rate is a proxy for what a car costs to keep on the road. The SEAT Mii sits 5.4 points above the national average, ranked 1,373 of 2,005 models. On one bought as repairable salvage, the mechanical side is less likely to spring surprises, so your repair estimate should hold up reasonably well.

Before you bid: run the lot through the analyzer, check the car's own record, check the mileage, decode the VIN, and if it carries a marker use the write-off value calculator. Or compare it against another model.

Looking at a specific SEAT Mii rather than the model in general? The free check covers its MOT and mileage history, and the full HPI report confirms the insurance write-off category, outstanding finance and whether it is recorded stolen, from licensed data for 5 credits. Already own one that has been damaged? Work out whether fixing it beats selling it with the repair or scrap calculator, and see recorded closing bids for damaged SEAT Miis at UK salvage auction.

Most common MOT failures on a SEAT Mii

  1. Fuel system leaking, or missing or ineffective filler cap, 1.3% of tests (10.5x the national rate for this defect)
  2. Emissions levels exceed default limits, 1.6% of tests (4.53x the national rate for this defect)
  3. Significant brake effort recorded with no brake applied indicating a binding brake, 3.2% of tests (3.1x the national rate for this defect)
  4. An SRS malfunction indicator lamp (MIL) indicates a system malfunction, 1.2% of tests (2.85x the national rate for this defect)
  5. Lambda coefficient outside the default limits or the range specified by the manufacturer, 1.2% of tests (2.39x the national rate for this defect)
  6. Brakes imbalance across an axle such that the braking effort from any wheel is less than 70% of the maximum effort recorded from the other wheel on the same axle., 1% of tests (1.93x the national rate for this defect)
  7. A rear registration plate lamp or light source missing or inoperative in the case of a single lamp or all lamps, 1.1% of tests (1.2x the national rate for this defect)
  8. Tyre tread depth not in accordance with the requirements, 2.4% of tests
  9. A suspension pin, bush or joint excessively worn, 2.2% of tests
  10. A tyre seriously damaged, 2.1% of tests

From 17,514 DVSA-tracked SEAT Mii tests, 2024. DVSA testers marked 4.66% of these flagged SEAT Mii defects as "dangerous", meaning the tester judged the car unsafe to drive away, against 5.11% nationally.

Most common MOT advisories on a SEAT Mii

An advisory doesn't fail the car - the tester flags it as worth watching, but it still passes. A different list from the failures above: what testers are noting on a SEAT Mii before it actually fails on it.

  1. Significant brake effort recorded with no brake applied indicating a binding brake, 4.7% of tests (2.33x the national rate for this advisory), also fails
  2. Excessive fluctuation in brake effort through each wheel revolution., 1.4% of tests (1.67x the national rate for this advisory)
  3. A tyre seriously damaged, 23.2% of tests (1.5x the national rate for this advisory), also fails
  4. Brake disc or drum significantly and obviously worn, 3.8% of tests (1.19x the national rate for this advisory)
  5. Tyre tread depth not in accordance with the requirements, 20.4% of tests, also fails
  6. Brake disc or drum excessively weakened, insecure or fractured, 8.4% of tests
  7. A suspension pin, bush or joint excessively worn, 8.1% of tests, also fails
  8. a brake lining or pad worn below 1.5mm, 4.9% of tests
  9. Brake pipe damaged or excessively corroded, 2.5% of tests
  10. Number plate inscription missing or illegible, 1.6% of tests

From 17,514 DVSA-tracked SEAT Mii tests, 2024.

SEAT Mii pass rate by model year

From its 2012 to its 2019 model year, the SEAT Mii's first-time pass rate has risen 15.2 points, from 77.6% to 92.8%, the usual pattern: a newer model year is a younger car today, so it fails less. First-time pass rate for each SEAT Mii year:

Other SEAT models

Models with a similar pass rate

If this car is a salvage or write-off

Embed this data

Run a site about the SEAT Mii? Embed the real DVSA pass-rate badge free, linked back to this page.

SEAT Mii MOT pass rate badge: 82.1%

<a href="https://www.salvageprophet.co.uk/mot/seat-mii"><img src="https://www.salvageprophet.co.uk/badge/seat-mii.svg" width="340" height="92" alt="SEAT Mii MOT Pass Rate: 82.1% - Salvage Prophet"></a>

Run a garage or parts site? Embed the SEAT Mii's top real failure reason instead, linked back here.

SEAT Mii most common MOT failure: Fuel system leaking, or missing or ineffective filler cap (1.3% of tests)

<a href="https://www.salvageprophet.co.uk/mot/seat-mii"><img src="https://www.salvageprophet.co.uk/badge/failure/seat-mii.svg" width="340" height="106" alt="SEAT Mii most common MOT failure: Fuel system leaking, or missing or ineffective filler cap (1.3% of tests) - Salvage Prophet"></a>

All 2,005 models ranked by MOT pass rate