AUDI S4 TDI MHEV QUATTRO AUTO (2021)
Running costs, common problems, and reliability data based on 119 real MOT tests in 2024.
MOT Pass Rate
96%
Total Tests (2024)
119
Avg Mileage
34,456 mi
Est. Annual Cost
£1,690
Is the 2021 AUDI S4 TDI MHEV QUATTRO AUTO reliable?
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 3 years old, 96% of AUDI S4 TDI MHEV QUATTRO AUTOs from 2021 passed their MOT first time in 2024. That's based on 119 tests across the UK. The average mileage at this age is 34,456 miles.
How does the 2021 AUDI S4 TDI MHEV QUATTRO AUTO compare?
Mileage Analysis
The average 2021 AUDI S4 TDI MHEV QUATTRO AUTO has 34,456 miles on the clock, 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.
How much does a 2021 AUDI S4 TDI MHEV QUATTRO AUTO cost to run?
Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT pass rate data. Insurance not included.
Checking a specific AUDI S4 TDI MHEV QUATTRO AUTO?
Enter the reg plate to see its individual MOT history, mileage verification, and predicted costs.
About the 2021 AUDI S4 TDI MHEV QUATTRO AUTO
The 2021 AUDI S4 TDI MHEV QUATTRO AUTO is a premium performance with a 2967cc diesel engine. 119 of these vehicles were MOT tested in 2024, making it a rare model on UK roads. It ranks in the top 19% of all 2021 cars for reliability.
With an average of 34,456 miles at 3 years old, AUDI S4 TDI MHEV QUATTRO AUTO 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 TDI MHEV QUATTRO AUTO 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 £1,245 per year at current diesel prices of 148p per litre (based on 7,400 miles per year).
What does it cost to own a 2021 AUDI S4 TDI MHEV QUATTRO AUTO?
Total estimated annual running cost is £1,690 (£141/month), broken down as £1245 fuel, £190 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.
Buying a Used 2021 AUDI S4 TDI MHEV QUATTRO AUTO
At 3 years old, this is still relatively fresh. You may find examples with remaining manufacturer warranty. Depreciation is slowing but hasn't bottomed out yet.
Alternatives to the 2021 AUDI S4 TDI MHEV QUATTRO AUTO
The AUDI S4 TDI MHEV QUATTRO AUTO is actually the most reliable option among similar diesel premium performances from this era. Here are comparable diesel cars with similar engines:
- MERCEDES E (2019) 90% pass rate (-6%) from 41,000 tests
- FORD RANGER (2019) 87% pass rate (-9%) from 32,194 tests
- AUDI Q5 (2019) 93% pass rate (-3%) from 24,241 tests
- AUDI A5 (2019) 90% pass rate (-6%) from 22,290 tests