Is the 2021 AUDI A4 reliable?

Excellent reliability. Very few MOT failures. 96% of AUDI A4s from 2021 passed their MOT first time in 2026, based on 531 tests. That's 14 points above the national average of 82%.

How much does a 2021 AUDI A4 cost to run?

Estimated annual running cost is £1,777 (£148/month), including £1327 fuel, £195 road tax, £55 MOT, and £200 predicted repairs.

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

The 2021 AUDI A4 has a 96% MOT pass rate based on 531 tests in 2026. This ranks 559 out of 3373 cars from 2021.

Which year AUDI A4 is most reliable?

The 2021 AUDI A4 has the highest MOT pass rate at 96%. The least reliable year is 1995 at 61%.

AUDI A4 (2021)

Q: What is the average mileage for a 2021 AUDI A4?

The average mileage for a 2021 AUDI A4 is 25,826 miles, which is below the expected 37,000 miles for a 5-year-old car. This suggests lighter use than average, which generally means less wear on major components.

Running costs, reliability data, and common problems from 531 real MOT tests.

Annual Cost

£1,777

£148/month

MOT Pass Rate

96%

Excellent

Road Tax

£195

Flat rate/year

Insurance

Grp 18-32

1984cc Petrol

Great Choice

96% pass rate, £1777/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

£1,327

Road Tax

Flat rate (post-2017)

£195

MOT Test

£55

Predicted Repairs

Low estimate due to excellent reliability

£200

Total per year£1,777

Per month£148/mo

Per week£34/wk

Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT data. Insurance not included.

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Reliability Verdict

96% MOT pass rate(Excellent)

0%National avg: 82%100%

Excellent reliability. Very few MOT failures. That's 14 points above the national average of 82%. It also outperforms the AUDI brand average of 90%.

At 5 years old, 96% of AUDI A4s from 2021 passed their MOT first time in 2026. That's based on 531 tests across the UK. The average mileage at this age is 25,826 miles.

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How Does It Compare?

Rank among 2021 cars559th of 3,373(top 17%)

Rank among AUDI models143th of 1,079(top 13%)

vs national average+14%(82% avg)

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

vs AUDI average+6%(90% avg)

Mileage Analysis

25,826

Average miles

37,000

Expected for age

The average 2021 AUDI A4 has 25,826 miles on the clock, which is below the expected 37,000 miles for a 5-year-old car. This suggests lighter use than average, which generally means less wear on major components.

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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

£1,582/year

92%

-4%

NISSAN QASHQAI

2020 · 1598cc Petrol

£1,582/year

93%

-3%

MINI COOPER

2019 · 1499cc Petrol

£1,582/year

92%

-4%

HYUNDAI TUCSON

2019 · 1591cc Petrol

£1,582/year

90%

-6%

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About the 2021 AUDI A4

The 2021 AUDI A4 is a premium with a 1984cc petrol engine. 531 of these vehicles were MOT tested in 2026, making it a less common model in the UK market. It ranks in the top 17% of all 2021 cars for reliability.

With an average of 25,826 miles at 5 years old, AUDI A4 owners tend to use this car less than the typical driver.

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 £1,327 per year at current petrol prices of 142p per litre (based on 7,400 miles per year).

What does it cost to own a 2021 AUDI A4?

Total estimated annual running cost is £1,777 (£148/month), broken down as £1327 fuel, £195 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 show better MOT pass rates than older ones, with an average improvement of 12 percentage points.

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

Based on the 2021 AUDI A4's fuel type, age, and engine size, these are the most likely problem areas to check.

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 annual running costs, insurance, and tax.

Car	Pass Rate	Fuel/yr	Tax/yr	Insurance	Total/yr
AUDI A4(2021)	96%	£1327	£195	Grp 18-32	£1777
VOLKSWAGEN GOLF(2019)	92%	£1137	£190	Grp 12-25	£1582-£195
NISSAN QASHQAI(2020)	93%	£1137	£190	Grp 12-25	£1582-£195
MINI COOPER(2019)	92%	£1137	£190	Grp 12-25	£1582-£195
HYUNDAI TUCSON(2019)	90%	£1137	£190	Grp 12-25	£1582-£195

Estimates based on 7,400 miles/year, current fuel prices, and MOT data. Insurance groups are indicative. Actual costs vary by driver, location, and usage.