2021 Seat Arona Technology Ecotsi S-A — MOT failures & pass rate

Across 1,633 MOT tests analysed for the 2021 Seat Arona Technology Ecotsi S-A, the most common recorded failure areas were brakes, tyres and lighting & signalling. Its pass rate of 91.5% was in line with the average for cars of a similar age (91.2%). Higher-mileage examples failed more often — 18.6% in the 60-90k group versus 7.3% in the 0-30k group.

Pass rate

1,633

MOT tests analysed

8.5%

Fail rate

in line with

vs cars of similar age

3.5

Avg age at test (yrs)

How it compares

Fail rate for this model-year against the segment and national averages for cars of a similar age.

Top failure categories

Most common MOT failure areas — 2021 Seat Arona Technology Ecotsi S-A
#	Category	% of tests affected	Tests
1	Brakes	4.6%	75
2	Tyres	3.5%	57
3	Lighting & signalling	2.1%	35
4	Seat belts & restraints	1.6%	26
5	Visibility	1.4%	23
6	Suspension	0.4%	6

Percentage of tests with at least one failure recorded in each category.

Most common specific failures

The exact components most often recorded as failures — more specific than the categories above.

Most frequently recorded failure items — 2021 Seat Arona Technology Ecotsi S-A
#	Failure item	Times recorded
1	Brake pads	48
2	Brake discs	30
3	Headlamp aim	30
4	Service brake performance	28
5	Tread depth	18
6	Washers	17

Top advisory categories

Advisories aren't failures, but they flag work likely needed soon — useful when budgeting.

Most common MOT advisories — 2021 Seat Arona Technology Ecotsi S-A
#	Category	% of tests with advisory	Tests
1	Brakes	23.1%	377
2	Tyres	16.4%	268
3	Other defects	6.1%	100
4	Visibility	1.7%	27
5	Suspension	1.0%	17
6	Steering	0.9%	15

Failure rate by mileage

Higher-mileage cars tend to fail more — often the most useful guide to real condition.

MOT fail rate by recorded mileage band.

Fail rate by recorded mileage — 2021 Arona Technology Ecotsi S-A
Mileage band	Tests	Fail rate
0-30k	1,163	7.3%
30-60k	427	10.8%
60-90k	43	18.6%

Failure rate by age

How this model-year's MOT fail rate climbs as the cars get older.

Trend over time

Fail rate by dataset year — 2021 Arona Technology Ecotsi S-A
Dataset year	Tests	Fail rate
2023	30	16.7%
2024	796	8.8%
2025	805	8.0%

What to check before buying a 2021 Arona Technology Ecotsi S-A

Before buying a 2021 Seat Arona Technology Ecotsi S-A, focus on the areas it most often fails on. Brakes accounted for 4.6% of tests for this year.

Brakes (4.6% of tests): Pads/discs are routine wear; binding, imbalance or corroded pipes are more serious — test for pulling under braking. Typical repair: £100–£350 per axle.
Tyres (3.5% of tests): Usually a quick, known-cost fix, but check tread, age and uneven wear (which can hint at alignment or suspension issues). Typical repair: £50–£120 per tyre.
Lighting & signalling (2.1% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.

Repair costs are rough UK ballpark ranges to set expectations, not quotes — actual prices vary widely by car, parts and garage.

Frequently asked questions

How many 2021 Seat Arona Technology Ecotsi S-As pass their MOT?

91.5% of the 1,633 2021 Seat Arona Technology Ecotsi S-A MOT tests in this dataset passed — a 8.5% fail rate.

What is the most common MOT failure on a 2021 Seat Arona Technology Ecotsi S-A?

Brakes, recorded in 4.6% of tests, followed by tyres (3.5%).

Does the 2021 Arona Technology Ecotsi S-A get worse with mileage?

Its MOT fail rate rises from 7.3% in the 0-30k band to 18.6% in the 60-90k band.

Methodology & source. Based on 1,633 MOT tests. Dataset: DVSA MOT testing data (2021,2022,2023,2024,2025). Data last updated 2026-07-01. Figures reflect MOT-testable defects only — read the methodology for how these are calculated and what they don't measure.