AUDI A3 S LINE 30 TFSI MHEV S-A (2021)
Running costs, reliability data, and common problems from 2,032 real MOT tests.
Annual Cost
£1,405
£117/month
MOT Pass Rate
93%
Excellent
Road Tax
£195
Flat rate/year
Insurance
Grp 1-8
999cc Petrol
Great Choice
93% pass rate, £1405/year to run. 11 points above average.
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Annual Running Costs
~50 mpg
Flat rate (post-2017)
Low estimate due to excellent reliability
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
Excellent reliability. Very few MOT failures. That's 11 points above the national average of 82%.
At 5 years old, 93% of AUDI A3 S LINE 30 TFSI MHEV S-As from 2021 passed their MOT first time in 2026. That's based on 2,032 tests across the UK. The average mileage at this age is 27,750 miles.
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How Does It Compare?
Mileage Analysis
27,750
Average miles
37,000
Expected for age
The average 2021 AUDI A3 S LINE 30 TFSI MHEV S-A has 27,750 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 95% MOT pass rate, while the 2022 model has the lowest at 87%. The 2021 sits between the two at 93%.
AUDI A3 S LINE 30 TFSI MHEV S-A by Year
Similar Cars to Consider
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About the 2021 AUDI A3 S LINE 30 TFSI MHEV S-A
The 2021 AUDI A3 S LINE 30 TFSI MHEV S-A is a premium with a 999cc petrol engine. 2,032 of these vehicles were MOT tested in 2026, making it a reasonably common sight on UK roads. Among all cars from 2021, the average MOT pass rate is 92%, and this model beats that benchmark.
With an average of 27,750 miles at 5 years old, AUDI A3 S LINE 30 TFSI MHEV S-A owners tend to use this car less than the typical driver.
2021 AUDI A3 S LINE 30 TFSI MHEV S-A Fuel Costs
The modest 999cc petrol engine keeps fuel costs low, which is a real advantage for a premium. Expect around 50 mpg in mixed driving, which works out to roughly £955 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 A3 S LINE 30 TFSI MHEV S-A?
Total estimated annual running cost is £1,405 (£117/month), broken down as £955 fuel, £195 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 93% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.
AUDI A3 S LINE 30 TFSI MHEV S-A Reliability Trend
Older AUDI A3 S LINE 30 TFSI MHEV S-As tend to have better MOT pass rates than newer ones, with an average decline of 5 percentage points across model years.
Buying a Used 2021 AUDI A3 S LINE 30 TFSI MHEV S-A
At 5 years old, the AUDI A3 S LINE 30 TFSI MHEV S-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 95%.
Common Issues to Watch For
Based on the 2021 AUDI A3 S LINE 30 TFSI MHEV S-A's fuel type, age, and engine size, these are the most likely problem areas to check.
Coil Pack Failure
Medium riskSmaller petrol engines are prone to ignition coil failures, causing misfires and rough running. Replacement is £50-£150 per coil.
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 A3 S LINE 30 TFSI MHEV S-A stacks up against similar cars for annual running costs, insurance, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Insurance | Total/yr |
|---|---|---|---|---|---|
| AUDI A3 S LINE 30 TFSI MHEV S-A(2021) | 93% | £955 | £195 | Grp 1-8 | £1405 |
| FORD FIESTA(2019) | 91% | £955 | £190 | Grp 1-8 | £1400-£5 |
| VOLKSWAGEN GOLF(2019) | 92% | £1137 | £190 | Grp 12-25 | £1582+£177 |
| VAUXHALL CORSA(2019) | 88% | £1137 | £190 | Grp 8-20 | £1732+£327 |
| MINI COOPER(2019) | 92% | £1137 | £190 | Grp 12-25 | £1582+£177 |
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.
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