AUDI A6 S LINE 50 TFSI E QUATTRO SA (2021)
Running costs, reliability data, and common problems from 186 real MOT tests.
Annual Cost
£1,777
£148/month
MOT Pass Rate
96%
Excellent
Road Tax
£195
Flat rate/year
Insurance
Grp 18-32
1984cc Hybrid
Great Choice
96% pass rate, £1777/year to run. 14 points above average.
Check a specific AUDI A6 S LINE 50 TFSI E QUATTRO SA
Enter a reg plate for full MOT history, mileage check, health score, running costs, and reliability data. Free, instant, no signup.
Annual Running Costs
~36 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.
Get an insurance quote for this AUDI A6 S LINE 50 TFSI E QUATTRO SA
Compare quotes and find the best deal
Reliability Verdict
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 5 years old, 96% of AUDI A6 S LINE 50 TFSI E QUATTRO SAs from 2021 passed their MOT first time in 2026. That's based on 186 tests across the UK. The average mileage at this age is 46,812 miles.
Got a AUDI A6 S LINE 50 TFSI E QUATTRO SA you're looking at?
Enter the reg plate to check its specific MOT history, mileage, and health score.
How Does It Compare?
Mileage Analysis
46,812
Average miles
37,000
Expected for age
The average 2021 AUDI A6 S LINE 50 TFSI E QUATTRO SA has 46,812 miles on the clock, which is above the expected 37,000 miles for a 5-year-old car. Higher-mileage cars often have more motorway miles, which is generally less harmful than stop-start urban driving.
Looking at a specific AUDI A6 S LINE 50 TFSI E QUATTRO SA?
Enter its reg plate for a free check with full MOT history, mileage verification, and predicted costs.
AUDI A6 S LINE 50 TFSI E QUATTRO SA by Year
Similar Cars to Consider
Check a Specific Audi A6 s line 50 tfsi e quattro sa
Enter a reg plate to get the full MOT history, health score, and mileage verification.
Upgrade to Premium (£4.99) for stolen, finance, and write-off checks.
About the 2021 AUDI A6 S LINE 50 TFSI E QUATTRO SA
The 2021 AUDI A6 S LINE 50 TFSI E QUATTRO SA is a premium with a 1984cc hybrid engine. 186 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. It ranks in the top 18% of all 2021 cars for reliability.
With an average of 46,812 miles at 5 years old, AUDI A6 S LINE 50 TFSI E QUATTRO SA owners cover more miles than the average driver.
2021 AUDI A6 S LINE 50 TFSI E QUATTRO SA Fuel Costs
The 1984cc hybrid 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 hybrid prices of 142p per litre (based on 7,400 miles per year). As a hybrid, real-world fuel costs will vary significantly depending on how much electric-only driving you do.
What does it cost to own a 2021 AUDI A6 S LINE 50 TFSI E QUATTRO SA?
Total estimated annual running cost is £1,777 (£148/month), broken down as £1327 fuel, £195 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 A6 S LINE 50 TFSI E QUATTRO SA
At 5 years old, the AUDI A6 S LINE 50 TFSI E QUATTRO 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 50 TFSI E QUATTRO SA's fuel type, age, and engine size, these are the most likely problem areas to check.
Hybrid Battery Health
Medium riskAfter 5 years, hybrid battery capacity may have reduced. A full replacement costs £2,000-£4,000, though reconditioning is cheaper at £500-£1,500.
Inverter and Power Electronics
Low riskThe inverter converts DC to AC for the electric motor. Failures are expensive (£1,500+) but relatively rare. Listen for unusual buzzing sounds.
Regenerative Braking
Medium riskBrake discs can corrode from reduced use (the electric motor handles most braking). Surface rust is normal but deep pitting needs attention.
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 50 TFSI E QUATTRO 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 50 TFSI E QUATTRO SA(2021) | 96% | £1327 | £195 | Grp 18-32 | £1777 |
| TOYOTA YARIS(2019) | 93% | £1137 | £190 | Grp 12-25 | £1582-£195 |
| MINI COOPER S(2019) | 92% | £1137 | £190 | Grp 12-25 | £1582-£195 |
| LAND ROVER RANGE ROVER SPORT(2019) | 94% | £1327 | £190 | Grp 18-32 | £1772-£5 |
| TOYOTA C-HR(2019) | 92% | £1327 | £190 | Grp 18-32 | £1772-£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.
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
TOYOTA YARIS
2019 · 1497cc Hybrid
MINI COOPER S
2019 · 1499cc Hybrid
LAND ROVER RANGE ROVER SPORT
2019 · 1997cc Hybrid
Related Guides
In-depth articles relevant to the Audi A6 s line 50 tfsi e quattro sa.
Cars That Lose Value Fastest: Models to Avoid for Depreciation
8 min read
Buying GuideIs an Extended Car Warranty Worth It? UK Guide for 2026
8 min read
Running CostsCheapest Cars to Run in 2026: Real Data from 19.8 Million MOT Tests
9 min read
Buying GuideFord Fiesta Common Problems (2026): What to Check Before Buying
13 min read
ReliabilityFord Puma Problems: 7 Issues Owners Report (2026)
13 min read
Check a specific AUDI A6 S LINE 50 TFSI E QUATTRO SA
Enter the reg to see its MOT history, mileage check, and predicted costs.
Premium History Check
Buying a AUDI A6 S LINE 50 TFSI E QUATTRO SA? Our premium check covers:
- Stolen check (PNC)
- Outstanding finance
- Write-off history (Cat A/B/N/S)
- Previous owners count
Competitors charge £10-£20 for the same data