At a Glance
The Seat Mii has 21 identified common problems across 1 generation, with the Mii (2011-2021) being the most affected generation and tyres & wheels the most common problem category. Based on 128K MOT tests from DVSA data.
Problems are patterns in the DVSA data that occur significantly more often on a specific model than the UK average — confirmed at 99% statistical confidence. Read our DVSA MOT data methodology →
Below: generation-by-generation comparison of Seat Mii common problems, MOT failure types, and pass-rate data drawn from DVSA records. Click any generation to see fuel- and engine-specific fault patterns, mileage-banded repair guidance, and the most common MOT failures testers record.
MOT Tests & Failures by Generation
Seat Mii generations by MOT tests, failures, and identified problems from DVSA data
Hover over each bar for a full breakdown. Tap any bar to view that generation's problems.
Showing total MOT tests, failures, and known problems per make. Hover over each bar for a full breakdown.
Tell Us About Your Problem
Help other Seat Mii owners — report a problem and we'll add it to the database
Tell Us About Your Problem
Help other Seat Mii owners — report a problem and we'll add it to the database
Looking for a garage to repair your Seat Mii?
Search our directory of 12,000+ UK garages by service and postcode — every garage has verified Google reviews.
Browse Seat Mii Generations
Select a generation to see its specific problems, MOT failures and advisories
Most Common Seat Mii MOT Failures
Every reason Seat Mii vehicles fail their MOT, ranked by frequency. Select an individual year to see only that year’s failures, or stay on ‘All time’ for the combined picture across our 20 years of DVSA data. Scroll inside the table for the full list.
| # | Failure | % of failures |
|---|---|---|
| 1 | Tyre tread depth below limit | 20.29% |
| 2 | Tyre condition | 18.74% |
| 3 | Brake pads or linings worn | 7.64% |
| 4 | Suspension joint or bush worn | 5.69% |
| 5 | Parking brake performance below minimum | 5.02% |
| 6 | Brake disc or drum worn | 4.67% |
| 7 | Windscreen damage affecting view | 3.34% |
| 8 | Stop lamp not working | 2.88% |
| 9 | Coil spring broken or corroded | 2.86% |
| 10 | Brake performance below minimum | 2.44% |
| 11 | Exhaust system fault | 2.02% |
| 12 | Indicator fault | 1.96% |
| 13 | Front lamp not working | 1.96% |
| 14 | Ball joint dust cover split | 1.89% |
| 15 | Spark ignition emissions above threshold | 1.86% |
| 16 | Shock absorber worn or leaking | 1.55% |
| 17 | Mirror damaged or missing | 1.15% |
| 18 | Wheel bearing worn | 1.13% |
| 19 | Number plate lamp not working | 1.03% |
| 20 | Driveshaft fault | 0.96% |
| 21 | Rear fog lamp not working | 0.83% |
| 22 | Horn not working | 0.80% |
| 23 | ABS fault | 0.61% |
| 24 | Tyre size or type not matched | 0.56% |
| 25 | Track rod end worn | 0.48% |
| 26 | Headlamp aim defect | 0.45% |
| 27 | Battery loose or leaking | 0.37% |
| 28 | Position lamp not working | 0.36% |
| 29 | Electronic stability control fault | 0.35% |
| 30 | Steering rack fault | 0.31% |
| 31 | Brake cable, rod, lever or linkage fault | 0.28% |
| 32 | Tyre valve stem damaged | 0.25% |
| 33 | Wiper blades deteriorated | 0.25% |
| 34 | Compression ignition emissions above threshold | 0.24% |
| 35 | Undertray damaged or missing | 0.24% |
| 36 | Headlamp levelling device fault | 0.21% |
| 37 | Rigid brake pipe corroded or damaged | 0.20% |
| 38 | Headlamp fault | 0.19% |
| 39 | Parking brake condition | 0.16% |
| 40 | Hydraulic brake cylinder fault | 0.16% |
| 41 | Suspension mounting corroded | 0.15% |
| 42 | MacPherson strut worn | 0.15% |
| 43 | Catalytic converter efficiency low | 0.14% |
| 44 | Engine oil leak | 0.14% |
| 45 | Front passenger door fault | 0.13% |
| 46 | Windscreen washer not working | 0.13% |
| 47 | Tyre pressure monitoring system fault | 0.12% |
| 48 | Brake pedal movement restricted | 0.11% |
| 49 | Fog lamp not working | 0.11% |
| 50 | Passenger airbag fault | 0.11% |
| 51 | Seat belt condition | 0.11% |
| 52 | Airbag warning light on | 0.09% |
| 53 | Subframe corrosion or damage | 0.09% |
| 54 | Brake pedal fault | 0.09% |
| 55 | Electrical switch fault | 0.09% |
| 56 | Brake fluid level low or contaminated | 0.07% |
| 57 | Bumper damaged or insecure | 0.07% |
| 58 | Fuel pipe corroded or damaged | 0.07% |
| 59 | Body corrosion or damage | 0.07% |
| 60 | Rear fog lamp warning light fault | 0.06% |
| 61 | Rear lamp not working | 0.06% |
| 62 | Brake valve fault | 0.05% |
| 63 | Daytime running lamp not working | 0.05% |
| 64 | Electrical wiring fault | 0.05% |
| 65 | Anti-roll bar worn or corroded | 0.05% |
| 66 | Brake fluid reservoir fault | 0.05% |
| 67 | Driver seat fault | 0.05% |
| 68 | Flexible brake hose damaged | 0.05% |
| 69 | Passenger seat fault | 0.05% |
| 70 | Vehicle structure corrosion | 0.05% |
| 71 | Brake lever fault | 0.04% |
| 72 | Driver door fault | 0.04% |
| 73 | Front suspension fault | 0.04% |
| 74 | Main beam warning light fault | 0.04% |
| 75 | Rear reflector damaged or missing | 0.04% |
| 76 | Brake hydraulic component worn | 0.03% |
| 77 | Electric power steering fault | 0.03% |
| 78 | Exhaust heat shield or sound insulation damaged | 0.03% |
| 79 | Front fog lamp not working | 0.03% |
| 80 | Fuel cap damaged or missing | 0.03% |
| 81 | Mirror or camera fault | 0.03% |
| 82 | Reversing lamp not working | 0.03% |
| 83 | Steering arm worn | 0.03% |
| 84 | Bonnet catch or hinge fault | 0.03% |
| 85 | Brake caliper fault | 0.03% |
| 86 | Brake fluid leak | 0.03% |
| 87 | Brake master cylinder fault | 0.03% |
| 88 | Chassis condition | 0.03% |
| 89 | Rear suspension fault | 0.03% |
| 90 | Reversing lamp switch fault | 0.03% |
| 91 | Suspension arm worn or corroded | 0.03% |
| 92 | Boot lid damaged or insecure | 0.02% |
| 93 | Brake wheel cylinder fault | 0.02% |
| 94 | Dashboard warning lamp fault | 0.02% |
| 95 | Hydraulic fluid leak | 0.02% |
| 96 | Outline marker lamp not working | 0.02% |
| 97 | Speedometer fault | 0.02% |
| 98 | Window damaged or won't operate | 0.02% |
| 99 | Suspension linkage fault | 0.02% |
| 100 | Electronic braking system fault | 0.01% |
| 101 | Front suspension joint worn | 0.01% |
| 102 | Headlamp washer not working | 0.01% |
| 103 | Propshaft fault | 0.01% |
| 104 | Seat belt anchorage fault | 0.01% |
| 105 | Seat belt pre-tensioner fault | 0.01% |
| 106 | Steering lock fault | 0.01% |
| 107 | Wheel hub fault | 0.01% |
| 108 | Body security fault | <0.01% |
| 109 | Body strengthening plate corroded | <0.01% |
| 110 | Brake air or vacuum system fault | <0.01% |
| 111 | Dip switch fault | <0.01% |
| 112 | Drag link end worn | <0.01% |
| 113 | Electronic parking brake fault | <0.01% |
| 114 | Engine mounting worn or broken | <0.01% |
| 115 | Exhaust leak | <0.01% |
| 116 | Fuel hose damaged or leaking | <0.01% |
| 117 | Fuel tank corroded or leaking | <0.01% |
| 118 | Handbrake cable fault | <0.01% |
| 119 | Load sensing valve fault | <0.01% |
| 120 | Power steering pipe or hose leaking | <0.01% |
| 121 | Steering operation fault | <0.01% |
| 122 | Steering wheel damaged or insecure | <0.01% |
| 123 | Tailgate damaged or insecure | <0.01% |
| 124 | Transmission oil leak | <0.01% |
Showing all 124 reasons — scroll inside the table for the full list.
Seat Mii MOT Failures by Category
Total MOT failure occurrences for the Seat Mii, grouped by category. Same data as the failures table above — just sliced by category instead of fault title. Hover a slice for the top failures in each category.
Join as a car owner — free
Get MOT reminders, a pre-MOT checklist, and tools to compare garages near you.
MOT Reminders
Free email alerts 28 and 7 days before your MOT expires.
44-Point MOT Checklist
Printable checklist to inspect your car before the test.
Save Favourite Garages
Save garages you trust and compare their ratings side by side.
Already a member? Sign in
Frequently Asked Questions
What are the most common Seat Mii problems?
Based on analysis of 128K Seat Mii MOT tests from DVSA data, we have 21 identified common problems across 1 generation. The most frequently flagged issue is "Wiper blades deteriorated". Tyres & Wheels is the most common problem category.
Which Seat Mii generation has the most problems?
The Seat Mii Mii (2011-2021) (2011–2021) has the highest number of identified common problems (24). Click the generation card above for the full breakdown.
How is this data calculated?
We analyse anonymised DVSA MOT test records under the Open Government Licence. An issue is classified as a "Common Problem" when it occurs significantly more often on a specific model than the UK average, confirmed at 99% statistical confidence. Read the full methodology page for details.
Can I report a problem with my Seat Mii?
Yes — use the "Tell Us About Your Problem" form on this page. Your report helps other Seat Mii owners spot problems early. All submissions are reviewed before being added to the public database.
Search Vehicles With Common Problems
Find common car problems, MOT failures, and advisories for any make and model
