AUDI A6 S LINE 45 TFSI MHEV QUAT SA (2021)
Running costs, reliability data, and common problems from 166 real MOT tests.
Annual Cost
£1,927
£161/month
MOT Pass Rate
89%
Good
Road Tax
£195
Flat rate/year
Insurance
Grp 18-32
1984cc Petrol
Solid Option
89% pass rate, £1927/year to run. 7 points above average.
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Annual Running Costs
~36 mpg
Flat rate (post-2017)
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
Good reliability. Occasional issues but generally solid. That's 7 points above the national average of 82%.
At 5 years old, 89% of AUDI A6 S LINE 45 TFSI MHEV QUAT SAs from 2021 passed their MOT first time in 2026. That's based on 166 tests across the UK. The average mileage at this age is 26,445 miles.
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How Does It Compare?
Mileage Analysis
26,445
Average miles
37,000
Expected for age
The average 2021 AUDI A6 S LINE 45 TFSI MHEV QUAT SA has 26,445 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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Best Year to Buy?
The most reliable year is the 2020 model with a 92% MOT pass rate, while the 2021 model has the lowest at 89%. Consider a different year if reliability is a priority.
AUDI A6 S LINE 45 TFSI MHEV QUAT SA by Year
Similar Cars to Consider
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About the 2021 AUDI A6 S LINE 45 TFSI MHEV QUAT SA
The 2021 AUDI A6 S LINE 45 TFSI MHEV QUAT SA is a premium with a 1984cc petrol engine. 166 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. It sits in the bottom 81% of 2021 cars for MOT pass rates.
With an average of 26,445 miles at 5 years old, AUDI A6 S LINE 45 TFSI MHEV QUAT SA owners tend to use this car less than the typical driver.
2021 AUDI A6 S LINE 45 TFSI MHEV QUAT SA 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 A6 S LINE 45 TFSI MHEV QUAT SA?
Total estimated annual running cost is £1,927 (£161/month), broken down as £1327 fuel, £195 road tax, £55 MOT, and £350 predicted repairs. Repair costs are moderate, reflecting the 89% pass rate. Keeping on top of servicing will help avoid surprises.
Buying a Used 2021 AUDI A6 S LINE 45 TFSI MHEV QUAT SA
At 5 years old, the AUDI A6 S LINE 45 TFSI MHEV QUAT SA 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 A6 S LINE 45 TFSI MHEV QUAT SA's fuel type, age, and engine size, these are the most likely problem areas to check.
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 A6 S LINE 45 TFSI MHEV QUAT SA stacks up against similar cars for annual running costs, insurance, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Insurance | Total/yr |
|---|---|---|---|---|---|
| AUDI A6 S LINE 45 TFSI MHEV QUAT SA(2021) | 89% | £1327 | £195 | Grp 18-32 | £1927 |
| VOLKSWAGEN GOLF(2019) | 92% | £1137 | £190 | Grp 12-25 | £1582-£345 |
| NISSAN QASHQAI(2020) | 93% | £1137 | £190 | Grp 12-25 | £1582-£345 |
| MINI COOPER(2019) | 92% | £1137 | £190 | Grp 12-25 | £1582-£345 |
| HYUNDAI TUCSON(2019) | 90% | £1137 | £190 | Grp 12-25 | £1582-£345 |
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.
Related Audi Models
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VOLKSWAGEN GOLF
2019 · 1498cc Petrol
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