2021 Audi A4 S Ln Blk Ed 35 Mhev Sa — MOT failures & pass rate

Across 2,958 MOT tests analysed for the 2021 Audi A4 S Ln Blk Ed 35 Mhev Sa, the most common recorded failure areas were tyres, visibility and lighting & signalling. Its pass rate of 89.9% was below the average for cars of a similar age (91.2%). Higher-mileage examples failed more often — 17.3% in the 60-90k group versus 8.0% in the 0-30k group.

Pass rate

2,958

MOT tests analysed

10.1%

Fail rate

worse than

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 Audi A4 S Ln Blk Ed 35 Mhev Sa
#	Category	% of tests affected	Tests
1	Tyres	8.8%	261
2	Visibility	1.1%	32
3	Lighting & signalling	0.8%	24
4	Brakes	0.5%	16
5	Suspension	0.4%	13
6	Other defects	0.2%	7

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 Audi A4 S Ln Blk Ed 35 Mhev Sa
#	Failure item	Times recorded
1	Tread depth	88
2	Headlamp aim	36
3	Wipers	21
4	Brake pads	13
5	Registration plates	12
6	Washers	11

Top advisory categories

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

Most common MOT advisories — 2021 Audi A4 S Ln Blk Ed 35 Mhev Sa
#	Category	% of tests with advisory	Tests
1	Tyres	24.7%	730
2	Other defects	7.9%	233
3	Brakes	6.7%	197
4	Suspension	4.0%	117
5	Visibility	2.9%	85
6	Lighting & signalling	0.3%	9

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 A4 S Ln Blk Ed 35 Mhev Sa
Mileage band	Tests	Fail rate
0-30k	1,359	8.0%
30-60k	1,426	11.2%
60-90k	156	17.3%

Failure rate by age

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

By fuel type

Fail rate by fuel type — 2021 A4 S Ln Blk Ed 35 Mhev Sa
Fuel	Tests	Fail rate
Petrol	2,927	10.1%
Hybrid	31	9.7%

Trend over time

Fail rate by dataset year — 2021 A4 S Ln Blk Ed 35 Mhev Sa
Dataset year	Tests	Fail rate
2023	81	8.6%
2024	1,420	10.2%
2025	1,455	10.0%

What to check before buying a 2021 A4 S Ln Blk Ed 35 Mhev Sa

Before buying a 2021 Audi A4 S Ln Blk Ed 35 Mhev Sa, focus on the areas it most often fails on. Tyres accounted for 8.8% of tests for this year.

Tyres (8.8% 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.
Visibility (1.1% of tests): Wipers, washers, mirrors and screen damage — usually inexpensive, but check for chips in the driver's line of sight. Typical repair: £15–£150.
Lighting & signalling (0.8% 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 Audi A4 S Ln Blk Ed 35 Mhev Sas pass their MOT?

89.9% of the 2,958 2021 Audi A4 S Ln Blk Ed 35 Mhev Sa MOT tests in this dataset passed — a 10.1% fail rate.

What is the most common MOT failure on a 2021 Audi A4 S Ln Blk Ed 35 Mhev Sa?

Tyres, recorded in 8.8% of tests, followed by visibility (1.1%).

Does the 2021 A4 S Ln Blk Ed 35 Mhev Sa get worse with mileage?

Its MOT fail rate rises from 8.0% in the 0-30k band to 17.3% in the 60-90k band.

Methodology & source. Based on 2,958 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.