MOT fail rates by first-use year

2021 Ford Fiesta MOT fail rate and common faults

How Ford Fiesta cars first used in 2021 did at their MOTs from 2024 to 2025, against all cars of the same age. From 56,695 DVSA MOT tests of these cars. First use is usually the date the car was first registered.

MOT data updated 28 September 2026

At 4 years, tested in 2025

MOT fail rate at age 4 (n=27,813)11.3%

All cars at 4 years (n=8,699,937)13.4%

Difference−2.0 pts

MOT tests of 2021 cars, 2024 to 202556,695

What stands out

In 2025, at 4 years old, Ford Fiesta cars first used in 2021 failed 11.3% of MOTs (27,813 tests), 2.0 points below the 13.4% for all cars that age.
From 2024 to 2025, as these cars went from 3 to 4 years old, the fail rate moved from 13.2% to 11.3%.
Ford Fiesta cars first used a year earlier, in 2020, failed 13.4% at the same age of 4 years (50,063 tests, in 2024).
The most common fail item that is not a wear item, for the Ford Fiesta at 4 years, is shock absorber leaking, at 0.5 per 100 MOTs (all cars: 0.2).

MOT fail rate by test year

Ford Fiesta cars first used in 2021: share of MOT tests that failed, by test year, against all cars of the same age. Years with fewer than 1,000 tests are not shown.
Test year	Age	MOT fail rate	Tests (n)	All cars	Difference
2024	3 years	13.2%	28,882	12.1%	+1.1 pts
2025	4 years	11.3%	27,813	13.4%	−2.0 pts

Most common faults at 4 years

These figures cover all Ford Fiesta MOTs at 4 years: cars first used 2018 to 2021, tested 2022 to 2025 (n=251,578). The list uses every first-use year so it has enough tests. Wear items (tyres, brake pads, wipers, bulbs) say more about upkeep than about the design.

MOT fail items

Fail item	Per 100 MOTs	All cars
Headlamp aim: too low Wear	2.2	0.6
Tyre tread below 1.6 mm Wear	1.9	1.4
Tyre condition: has a cut in excess of the requirements deep enough to reach the ply or cords Wear	1.1	1.5
Brake pads under 1.5 mm Wear	1.0	1.3
Washers: provides insufficient washer liquid Wear	1.0	0.7
Tyre with cords exposed Wear	0.6	0.9
Shock absorber leaking	0.5	0.2
Tyre condition: has a bulge, caused by separation or partial failure of its structure Wear	0.4	0.4
Washers: not working Wear	0.4	0.3
Wipers not clearing screen Wear	0.4	2.5

Per 100 of the MOTs above (n=251,578). A test with two items counts once for each.

Advisories

Advisory	Per 100 MOTs	All cars
Tyre tread close to the legal limit or worn on the edge Wear	13.9	12.4
Tyre condition: slightly damaged/cracking or perishing Wear	8.2	6.3
Brake pads wearing thin Wear	6.5	6.9
Brake discs: worn, pitted or scored, but not seriously weakened	4.2	5.2
Tyre condition: has a cut but not deep enough to reach the ply or cords Wear	2.3	1.8
Non-component advisories: Nail in tyre	2.1	2.1
Tyre tread close to the legal limit, under the 1.0 mm rule Wear	1.6	1.8
Shock absorber misting oil	1.5	1.2
Non-component advisories: Child Seat fitted not allowing full inspection of adult belt	1.4	2.2
Tyre condition: slightly damaged Wear	1.4	0.7

Per 100 of the MOTs above (n=251,578). A test with two items counts once for each.

Fuel type at 4 years

These figures cover all Ford Fiesta MOTs at 4 years: cars first used 2018 to 2021, tested 2022 to 2025 (n=251,578). Each fuel is set against all cars of the same fuel and age. Fuels with fewer than 1,000 tests are not shown.

Fuel	Share of tests	MOT fail rate	Tests (n)	All cars, same fuel	Median mileage
Petrol	96.9%	12.2%	243,775	12.0%	24,401 miles
Diesel	3.0%	15.8%	7,482	16.5%	44,325 miles

Fail rate by mileage at 4 years

These figures cover all Ford Fiesta MOTs at 4 years: cars first used 2018 to 2021, tested 2022 to 2025 (n=251,578). At 4 years, Ford Fiesta cars at 60,000 to 90,000 miles failed more often (22.1%, n=6,449) than those at under 30,000 miles (9.8%, n=162,871). Bands with fewer than 1,000 tests are not shown.

Mileage at test	MOT fail rate	Tests (n)	All cars
Under 30,000 miles	9.8%	162,871	10.2%
30,000 to 60,000 miles	16.5%	80,407	15.5%
60,000 to 90,000 miles	22.1%	6,449	20.7%

Car tax rules for a 2021 car

Cars first registered from 1 April 2017 pay a first-year rate set by CO2 emissions, then the standard rate each year. A petrol, diesel or hybrid car with a list price over £40,000 also pays the expensive car supplement for five years, from the second tax payment.

These are the rules, not the amount for a specific car. Car tax check

ULEZ and clean air zones

Petrol cars first registered from 2006 usually meet Euro 4, the petrol standard for the London ULEZ, so they usually do not pay the daily charge.
Diesel cars first registered from September 2015 usually meet Euro 6, the diesel standard for the London ULEZ, so they usually do not pay the daily charge.
The clean air zones in Birmingham and Bristol use the same Euro 4 petrol and Euro 6 diesel standards. The low emission zones in Scotland use them too, but enforce them with fines, not a daily charge.

The Euro standard of the car decides, not the year alone. ULEZ checker

Other years of the Ford Fiesta

2020 Ford Fiesta 2022 Ford Fiesta

Other Ford models first used in 2021

Model	Age at test	MOT fail rate	Tests (n)	All cars
Ford Puma (2021)	4 years in 2025	7.4%	28,400	13.4%
Ford Focus (2021)	4 years in 2025	11.1%	20,933	13.4%
Ford Kuga (2021)	4 years in 2025	10.8%	20,647	13.4%
Ford Ranger (2021)	4 years in 2025	20.3%	16,040	13.4%
Ford EcoSport (2021)	4 years in 2025	13.3%	5,176	13.4%
Ford Transit Courier (2021)	4 years in 2025	21.7%	3,551	13.4%
Ford Tourneo Custom (2021)	4 years in 2025	21.4%	2,913	13.4%
Ford Tourneo Connect (2021)	4 years in 2025	17.3%	1,738	13.4%

More on the Ford Fiesta

Read this with care. A fail rate is not a measure of build quality. How far cars are driven, how they are used and how well owners maintain them all change it, and wear items such as tyres and brake pads are common fails. Compare a model only with cars of the same age. Methodology and limits.

Found one you might buy? Vet the specific car.

These figures describe 2021 Ford Fiesta cars as a group, not any one car. The VetTheCar Buying Report looks at the car you are buying: its MOT history, what similar cars did next, and what to ask the seller.

See an example Buying Report All car tools

Source

Contains public sector information licensed under the Open Government Licence v3.0. Source: DVSA anonymised MOT test data, class 4 normal MOT tests, 2022 to 2025. MOT data updated 28 September 2026.

Not affiliated with or endorsed by DVSA. How we calculate these figures · Data sources

Car tax and clean air zone rules are summarised from GOV.UK and Transport for London guidance. They are general rules and are not drawn from the MOT data.