Is the 2020 AUDI A4 reliable?

Excellent reliability. Very few MOT failures. 92% of AUDI A4s from 2020 passed their MOT first time in 2026, based on 13,420 tests. That's 10 points above the national average of 82%.

How much does a 2020 AUDI A4 cost to run?

Estimated annual running cost is £1,487 (£124/month), including £1037 fuel, £195 road tax, £55 MOT, and £200 predicted repairs.

What is the MOT pass rate for a 2020 AUDI A4?

The 2020 AUDI A4 has a 92% MOT pass rate based on 13,420 tests in 2026. This ranks 1226 out of 2596 cars from 2020.

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%.

What is the average mileage for a 2020 AUDI A4?

The average mileage for a 2020 AUDI A4 is 39,596 miles, which is in line with the expected 44,400 miles for a 6-year-old car, suggesting normal everyday use.

AUDI A4 (2020)

Running costs, reliability data, and common problems from 13,420 real MOT tests.

Annual Cost

£1,487

£124/month

MOT Pass Rate

92%

Excellent

Road Tax

£195

Flat rate/year

Insurance

Grp 18-32

1968cc Diesel

Great Choice

92% pass rate, £1487/year to run. 10 points above average.

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Diesel1968cc6 years old13,420 tests40k miles avg

Annual Running Costs

Fuel (Diesel, 1968cc)

~48 mpg

£1,037

Road Tax

Flat rate (post-2017)

£195

MOT Test

£55

Predicted Repairs

Low estimate due to excellent reliability

£200

Total per year£1,487

Per month£124/mo

Per week£29/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

92% MOT pass rate(Excellent)

0%National avg: 82%100%

Excellent reliability. Very few MOT failures. That's 10 points above the national average of 82%.

At 6 years old, 92% of AUDI A4s from 2020 passed their MOT first time in 2026. That's based on 13,420 tests across the UK. The average mileage at this age is 39,596 miles.

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How Does It Compare?

Rank among 2020 cars1226th of 2,596(top 47%)

Rank among AUDI models501th of 1,079(top 46%)

vs national average+10%(82% avg)

vs 2020 cars average+0%(92% avg)

vs AUDI average+2%(90% avg)

Mileage Analysis

39,596

Average miles

44,400

Expected for age

The average 2020 AUDI A4 has 39,596 miles on the clock, which is in line with the expected 44,400 miles for a 6-year-old car, suggesting normal everyday use.

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Best Year to Buy?

The most reliable year is the 2021 model with a 96% MOT pass rate, while the 1995 model has the lowest at 61%. The 2020 sits between the two at 92%.

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

2018 · 1968cc Diesel

£1,482/year

92%

same

FORD FOCUS

2019 · 1499cc Diesel

£1,500/year

89%

-3%

VOLKSWAGEN POLO

2018 · 1598cc Diesel

£1,500/year

84%

-8%

FORD KUGA

2019 · 1997cc Diesel

£1,482/year

91%

-1%

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About the 2020 AUDI A4

The 2020 AUDI A4 is a premium with a 1968cc diesel engine. 13,420 of these vehicles were MOT tested in 2026, making it one of the most commonly tested cars on UK roads. Among all cars from 2020, the average MOT pass rate is 92%, and this model falls short of that benchmark.

With an average of 39,596 miles at 6 years old, AUDI A4 owners drive about as much as the UK average.

2020 AUDI A4 Fuel Costs

The 1968cc diesel engine offers a reasonable balance between performance and economy. Expect around 48 mpg in mixed driving, which works out to roughly £1,037 per year at current diesel prices of 148p per litre (based on 7,400 miles per year). Diesel cars of this age should have their DPF (diesel particulate filter) checked, as replacements can be costly.

What does it cost to own a 2020 AUDI A4?

Total estimated annual running cost is £1,487 (£124/month), broken down as £1037 fuel, £195 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 92% 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 2020 AUDI A4

At 6 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. If you're flexible on year, the 2021 model has the highest pass rate at 96%. With 13,420 MOT tests in our data, there's strong statistical confidence in these figures.

Common Issues to Watch For

Based on the 2020 AUDI A4's fuel type, age, and engine size, these are the most likely problem areas to check.

DPF (Diesel Particulate Filter)

Watch out

Short journeys clog the DPF. Replacement costs £1,000-£2,500. Check the DPF warning light and ask about driving patterns.

Turbo Wear

Medium risk

Diesel turbos work harder and wear faster. Listen for whining noises and check for oil leaks around the turbo housing.

AdBlue System

Medium risk

Post-2015 diesels use AdBlue for emissions. Sensor failures and tank heater issues are common. Budget £200-£500 for repairs.

EGR Valve

Watch out

Exhaust Gas Recirculation valves clog with carbon deposits, causing rough running and poor economy. Cleaning costs £150-£300, replacement £300-£600.

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 2020 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(2020)	92%	£1037	£195	Grp 18-32	£1487
VOLKSWAGEN GOLF(2018)	92%	£1037	£190	Grp 18-32	£1482-£5
FORD FOCUS(2019)	89%	£905	£190	Grp 12-25	£1500+£13
VOLKSWAGEN POLO(2018)	84%	£905	£190	Grp 12-25	£1500+£13
FORD KUGA(2019)	91%	£1037	£190	Grp 18-32	£1482-£5

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.