Audi S4 Black Edition TDI Quattro A (2021)
Estimated running costs and MOT pass rates from 64 MOT tests in 2024.
Annual Cost
£2,131
£178/month
MOT Pass Rate
98%
Excellent
Road Tax
£200
Standard rate/year
Est. Insurance
Grp 30-42
2967cc Diesel
Great Choice
98% pass rate, £2,131/year to run. 16 points above average.
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Annual Running Costs
~40 mpg
Standard rate (from April 2017)
Low estimate due to excellent reliability
Estimates based on 7,400 miles/year (UK average), diesel at 199.33p 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
Excellent reliability. Very few MOT failures. That's 16 points above the average of 82% across all models in our data. It also outperforms the Audi brand average of 90%.
98% of MOT tests on Audi S4 Black Edition TDI Quattro As from 2021 ended in a pass in 2024, when they were about 3 years old. That's based on 64 tests across the UK, retests included. The average mileage recorded at those tests was 35,102 miles.
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How Does It Compare?
Mileage Analysis
35,102
Average miles
22,200
Expected for age
The average 2021 Audi S4 Black Edition TDI Quattro A had 35,102 miles on the clock at its 2024 MOT, which is well above the expected 22,200 miles for a 3-year-old car. Check service history carefully, as high-mileage cars need consistent maintenance to stay reliable.
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Best Year to Buy?
Of the years with at least 100 tests, the 2020 model has the highest MOT pass rate at 94%, while the 2019 model has the lowest at 91%. The 2021 scores 98%. Newer cars usually pass more often simply because they are younger, so compare years of a similar age.
Audi S4 Black Edition TDI Quattro A by Year
Similar Cars to Consider
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About the 2021 Audi S4 Black Edition TDI Quattro A
The 2021 Audi S4 Black Edition TDI Quattro A is a premium performance car. Our records list a 2967cc diesel engine, though engines vary between versions. 64 MOT tests were recorded on this model in 2024, making it a rare model on UK roads. It ranks in the top 8% of all 2021 models for MOT pass rate.
With an average of 35,102 miles recorded at its 2024 MOT tests, Audi S4 Black Edition TDI Quattro A owners cover more miles than the average driver. High-mileage examples should be checked carefully for wear on suspension, brakes, and drivetrain components.
2021 Audi S4 Black Edition TDI Quattro A Fuel Costs
The 2967cc diesel engine is on the larger side, so fuel won't be this car's strong point. Expect around 40 mpg in mixed driving, which works out to roughly £1,676 per year with diesel at 199.33p per litre (GOV.UK weekly average, week of 19 October 2026; 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 2021 Audi S4 Black Edition TDI Quattro A?
Total estimated annual running cost is £2,131 (£178/month), broken down as £1,676 fuel, £200 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 98% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.
Buying a Used 2021 Audi S4 Black Edition TDI Quattro A
At 5 years old, the Audi S4 Black Edition TDI Quattro A 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 2020 model has the highest pass rate at 94%. Note: with only 64 tests in our data, these figures should be treated as indicative rather than definitive.
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.
DPF (Diesel Particulate Filter)
Watch outShort journeys clog the DPF. Replacement costs £1,000-£2,500. Check the DPF warning light and ask about driving patterns.
Turbo Wear
Medium riskDiesel turbos work harder and wear faster. Listen for whining noises and check for oil leaks around the turbo housing.
AdBlue System
Medium riskPost-2015 diesels use AdBlue for emissions. Sensor failures and tank heater issues are common. Budget £200-£500 for repairs.
EGR Valve
Low riskExhaust Gas Recirculation valves clog with carbon deposits, causing rough running and poor economy. Cleaning costs £150-£300, replacement £300-£600.
Dual Mass Flywheel
Medium riskLarger diesel engines put extra strain on the dual mass flywheel. Listen for rattling at idle. Replacement with clutch is £800-£1,500.
Service History
Low riskAlways 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 S4 Black Edition TDI Quattro A 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 S4 Black Edition TDI Quattro A(2021) | 98% | £1,676 | £200 | Grp 30-42 | £2,131 |
| Mercedes E(2019) | 90% | £1,676 | £200 | Grp 30-42 | £2,131same |
| Ford Ranger(2019) | 87% | £1,676 | £200 | Grp 35-50 | £2,281+£150 |
| Audi Q5(2019) | 93% | £1,676 | £200 | Grp 30-42 | £2,131same |
| Audi A5(2019) | 90% | £1,676 | £200 | Grp 30-42 | £2,131same |
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 S4 Black Edition TDI Quattro A
Is the 2021 Audi S4 Black Edition TDI Quattro A reliable?
Excellent reliability. Very few MOT failures. 98% of MOT tests on 2021 Audi S4 Black Edition TDI Quattro As ended in a pass, from 64 tests (DVSA MOT data for tests in 2024, retests included). That's 16 points above the average of 82% across all models in the same data.
How much does a 2021 Audi S4 Black Edition TDI Quattro A cost to run?
Our estimate is £2,131 a year (£178 a month): £1,676 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 S4 Black Edition TDI Quattro A?
98% of 64 MOT tests on the 2021 Audi S4 Black Edition TDI Quattro A ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 236th of 3,336 models first registered in 2021 (top 8%).
Which year Audi S4 Black Edition TDI Quattro A has the best MOT pass rate?
Of the years with at least 100 tests, the 2020 Audi S4 Black Edition TDI Quattro A has the highest MOT pass rate at 94% and the 2019 the lowest at 91%. 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 S4 Black Edition TDI Quattro A?
The average mileage recorded at MOT tests on the 2021 Audi S4 Black Edition TDI Quattro A is 35,102 miles, which is well above the expected 22,200 miles for a 3-year-old car. Check service history carefully, as high-mileage cars need consistent maintenance to stay reliable.
Related Audi Models
Explore other Audi cars or similar models in the same category.
Audi A3
2015 · 1598cc Diesel
Audi A1
2016 · 1395cc Petrol
Audi A4
2017 · 1968cc Diesel
Mercedes E
2019 · 2925cc Diesel
Ford Ranger
2019 · 3198cc Diesel
Audi Q5
2019 · 2967cc Diesel
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