Audi A4 (2021)

Estimated running costs and MOT pass rates from 531 MOT tests in 2024.

Annual Cost

£2,086

£174/month

MOT Pass Rate

96%

Excellent

Road Tax

£200

Standard rate/year

Est. Insurance

Grp 18-32

1984cc Petrol

Great Choice

96% pass rate, £2,086/year to run. 14 points above average.

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Petrol1984cc5 years old531 tests26k miles avg

Annual Running Costs

Fuel (Petrol, 1984cc)

~36 mpg

£1,631

Road Tax

Standard rate (from April 2017)

£200

MOT Test

£55

Predicted Repairs

Low estimate due to excellent reliability

£200

Total per year£2,086

Per month£174/mo

Per week£40/wk

Estimates based on 7,400 miles/year (UK average), petrol at 174.57p a litre (GOV.UK weekly average, week of 19 October 2026), GOV.UK road tax rates and repair likelihood from MOT data. Insurance not included. Cars registered from April 2017 pay the £200 standard rate, plus £440 a year for five years (from the second year) if they cost over £40,000 new (over £50,000 for electric cars).

Reliability Verdict

96% MOT pass rate(Excellent)

0%All-model avg: 82%100%

Excellent reliability. Very few MOT failures. That's 14 points above the average of 82% across all models in our data. It also outperforms the Audi brand average of 90%.

96% of MOT tests on Audi A4s from 2021 ended in a pass in 2024, when they were about 3 years old. That's based on 531 tests across the UK, retests included. The average mileage recorded at those tests was 25,826 miles.

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How Does It Compare?

Rank among 2021 models542nd of 3,336(top 17%)

Rank among Audi models142nd of 1,066(top 14%)

vs average of all models+14%(82% avg)

vs 2021 models average+4%(92% avg)

vs Audi average+6%(90% avg)

Mileage Analysis

25,826

Average miles

22,200

Expected for age

The average 2021 Audi A4 had 25,826 miles on the clock at its 2024 MOT, which is in line with the expected 22,200 miles for a 3-year-old car, suggesting normal everyday use.

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Audi A4 by Year

Year	Pass Rate	Tests	Avg Mileage
2021	96%	531	25,826 mi
2020	92%	13,420	39,596 mi
2019	91%	25,771	48,333 mi
2018	89%	27,431	57,063 mi
2017	88%	41,848	70,662 mi
2016	85%	41,258	82,779 mi
2015	85%	31,961	92,608 mi
2014	84%	33,458	102,945 mi
2013	84%	32,559	109,938 mi
2012	83%	26,765	120,869 mi
2011	82%	26,901	130,117 mi
2010	80%	25,855	136,452 mi
2009	79%	26,384	138,021 mi
2008	78%	31,415	137,710 mi
2007	77%	30,996	136,433 mi
2006	76%	26,758	137,214 mi
2005	75%	15,245	139,515 mi
2004	74%	12,946	146,260 mi
2003	74%	7,402	148,576 mi
2002	72%	3,944	156,746 mi
2001	74%	1,748	148,131 mi
2000	76%	1,674	149,460 mi
1999	76%	2,062	160,008 mi
1998	75%	1,597	153,893 mi
1997	74%	842	161,934 mi
1996	77%	556	158,416 mi
1995	61%	208	153,421 mi

Similar Cars to Consider

Volkswagen Golf

2019 · 1498cc Petrol

£1,853/year

92%

-4%

Nissan Qashqai

2020 · 1598cc Petrol

£1,853/year

93%

-3%

MINI Cooper

2019 · 1499cc Petrol

£1,853/year

92%

-4%

Hyundai Tucson

2019 · 1591cc Petrol

£1,853/year

90%

-6%

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About the 2021 Audi A4

The 2021 Audi A4 is a premium car. Our records list a 1984cc petrol engine, though engines vary between versions. 531 MOT tests were recorded on this model in 2024, making it a less common model in the UK market. It ranks in the top 17% of all 2021 models for MOT pass rate.

With an average of 25,826 miles recorded at its 2024 MOT tests, Audi A4 owners drive about as much as the UK average.

2021 Audi A4 Fuel Costs

The 1984cc petrol engine offers a reasonable balance between performance and economy. Expect around 36 mpg in mixed driving, which works out to roughly £1,631 per year with petrol at 174.57p per litre (GOV.UK weekly average, week of 19 October 2026; based on 7,400 miles per year).

What does it cost to own a 2021 Audi A4?

Total estimated annual running cost is £2,086 (£174/month), broken down as £1,631 fuel, £200 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 96% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.

Audi A4 Reliability Trend

Newer Audi A4s pass their MOT more often than older ones, by 12 percentage points on average, which is mostly down to age and wear.

Buying a Used 2021 Audi A4

At 5 years old, the Audi A4 offers good value with plenty of life remaining. Most manufacturer warranties will have expired, so a pre-purchase inspection is worth the cost.

Common Issues to Watch For

These are typical issues for cars of this age, fuel type and engine size, not faults recorded on this model's MOT tests. Use them as a checklist when you view one.

Service History

Low risk

Always request a full service history. Regular servicing is the single best indicator of how well a car has been maintained, regardless of mileage.

Running Costs Compared

How the 2021 Audi A4 stacks up against similar cars for estimated annual running costs, insurance group, and tax.

Car	Pass Rate	Fuel/yr	Tax/yr	Est. Ins. Group	Total/yr
Audi A4(2021)	96%	£1,631	£200	Grp 18-32	£2,086
Volkswagen Golf(2019)	92%	£1,398	£200	Grp 12-25	£1,853-£233
Nissan Qashqai(2020)	93%	£1,398	£200	Grp 12-25	£1,853-£233
MINI Cooper(2019)	92%	£1,398	£200	Grp 12-25	£1,853-£233
Hyundai Tucson(2019)	90%	£1,398	£200	Grp 12-25	£1,853-£233

Estimates based on 7,400 miles/year, GOV.UK average pump prices for the week of 19 October 2026, GOV.UK road tax rates and MOT data. Insurance groups are our rough estimate from engine size, not official groups. Actual costs vary by driver, location, and usage.

Questions about the 2021 Audi A4

Is the 2021 Audi A4 reliable?

Excellent reliability. Very few MOT failures. 96% of MOT tests on 2021 Audi A4s ended in a pass, from 531 tests (DVSA MOT data for tests in 2024, retests included). That's 14 points above the average of 82% across all models in the same data.

How much does a 2021 Audi A4 cost to run?

Our estimate is £2,086 a year (£174 a month): £1,631 fuel, £200 road tax, £55 MOT and £200 predicted repairs, based on 7,400 miles a year. Insurance is not included.

What is the MOT pass rate for a 2021 Audi A4?

96% of 531 MOT tests on the 2021 Audi A4 ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 542nd of 3,336 models first registered in 2021 (top 17%).

Which year Audi A4 has the best MOT pass rate?

Of the years with at least 100 tests, the 2021 Audi A4 has the highest MOT pass rate at 96% and the 1995 the lowest at 61%. Newer cars usually pass more often simply because they are younger and have done fewer miles.

What is the average mileage for a 2021 Audi A4?

The average mileage recorded at MOT tests on the 2021 Audi A4 is 25,826 miles, which is in line with the expected 22,200 miles for a 3-year-old car, suggesting normal everyday use.