Audi A6 reliability, MPG and running costs
Figures updated
The Audi A6 is a executive car; the latest version we cover is the C9 (2025–). In 2024 MOT tests it scored 155 for reliability (100 is average), ranking 54 of 442, and 20.9% failed first time against a UK average of 28.5%. Its most common MOT failure is tread depth (2.9% of tests). Boot space is 492 litres.
Audi A6 key specs (C9 (2025–), 4-door saloon)
Price new
from £54,060
Boot
492 litres
Seats
5
Size (L × W × H)
4,999 × 1,875 × 1,452mm
Power
204–299 PS
0–62mph
6.0–8.2 sec
Euro NCAP
5 stars (2024)
2025 on models; figures vary by version. Prices from the October 2026 price list. Sources: audi.co.uk, oneaudi-falcon-asset-urls.prod.renderer.one.audi, euroncap.com.
Ranked 54 of 442 cars in the 2024 MOT Reliability League, and 4 of 16 executive cars
In 2024, 122,625 Audi A6s aged 3 to 20 had an MOT and 20.9% failed first time (UK average 28.5%). Taking age and mileage into account, the Audi A6 is 35% less likely to fail than the average car of the same age and mileage. At the first MOT, at three years old, 9.5% failed (UK 12.7%).
First-time fail rate
20.9%
UK 28.5%
Fail rate at 3 years
9.5%
UK 12.7%
Average miles a year
11,000
Typical age at test: 9 years
Audi A6 MOT failure rate by age
Most common Audi A6 MOT faults
- Tread depth: tread depth below requirements of 1.6mm2.9% of tests
- Malfunction indicator lamp: inoperative or indicates a malfunction2.3% of tests
- Condition: has ply or cords exposed1.6% of tests
- Pins and bushes: pin or bush excessively worn1.5% of tests
- Coil spring: fractured or broken1.5% of tests
- Condition: has a cut in excess of the requirements deep enough to reach the ply or cords1.5% of tests
What the Audi A6 fails on
| Area | Tests failing | vs similar cars |
|---|---|---|
| Tyres | 7.1% | About average |
| Lights and electrics | 6.0% | ▼ 55% less often |
| Suspension | 5.6% | ▼ 49% less often |
| Brakes | 2.9% | ▼ 65% less often |
| Exhaust and emissions | 2.8% | ▼ 29% less often |
| Visibility | 2.5% | ▼ 50% less often |
| Body and structure | 2.4% | ▼ 42% less often |
| Seat belts and airbags | 1.1% | About average |
| Wheels | 0.5% | About average |
| Steering | 0.5% | ▼ 82% less often |
How big is the Audi A6's boot?
The C9 (2025–) Audi A6 has 492 litres of boot space with the rear seats up, according to the manufacturer. That's the 3rd biggest of the 8 executive cars we compare; the Mercedes-Benz E-Class has the most, at 540 litres.
What MPG does the Audi A6 do?
Official economy for the Audi A6 ranges from 19.3 to 67.3mpg across the 483 versions listed by the Vehicle Certification Agency (2004–2025). A typical petrol version manages 39.8mpg and a typical diesel 62.8mpg. Electric versions average 4 miles per kWh, with an official range of 329 to 462 miles. Expect 10–15% less in real-world driving.
Work out a journey's fuel costHow much is road tax on a Audi A6?
Any Audi A6 first registered from April 2017 pays the standard rate of £200 a year after its first year (2026/27 rates). A Audi A6 registered between March 2001 and March 2017 is taxed on its CO2: £20 to £790 a year.
Work out tax for a specific carAudi A6 specs and running costs
Official figures for 483 versions sold in the UK between 2004 and 2025.
Fuel types
Diesel, Electric, Hybrid, Petrol, Plug-in hybrid
Official economy
19.3–67.3 mpg
Electric range
329–462 miles
Efficiency
4.0–5.0 mi/kWh
CO2
32–350 g/km
Power
204–428 PS
| Version | Fuel | Economy | CO2 | Car tax | Company car tax |
|---|---|---|---|---|---|
| A6 e-tron Avant A6 Avant e-tron286 PS · N/A · listed 2025 | Electric | 4 mi/kWh | 0g | £200 | 4% |
| A6 e-tron Sportback e-tron 210 00 kW286 PS · N/A · listed 2025 | Electric | 5 mi/kWh | 0g | £200 | 4% |
| A6 e-tron Avant e-tron performance 270 00 kW367 PS · N/A · listed 2025 | Electric | 4 mi/kWh | 0g | £200 | 4% |
| A6 e-tron Sportback e-tron performance 270 00 kW367 PS · N/A · listed 2025 | Electric | 4 mi/kWh | 0g | £200 | 4% |
| A6 e-tron Avant e-tron quattro 315 00 kW428 PS · N/A · listed 2025 | Electric | 4 mi/kWh | 0g | £200 | 4% |
| A6 e-tron Sportback e-tron quattro 315 00 kW428 PS · N/A · listed 2025 | Electric | 4 mi/kWh | 0g | £200 | 4% |
| A6 Avart TDI quattro 204PS (C9)204 PS · A7 · listed 2025 | Hybrid | 54.3 mpg | 137g | £200 | 33% |
| A6 Avart 40 TDI quattro 204PS204 PS · A7 · listed 2025 | Hybrid | 48.7 mpg | 152g | £200 | 36% |
| A6 Saloon 40 TFSI 204PS204 PS · A7 · listed 2025 | Hybrid | 38.7 mpg | 165g | £200 | 37% |
| A6 Saloon 40 TDI quattro 204PS204 PS · A7 · listed 2025 | Hybrid | 50.4 mpg | 148g | £200 | 35% |
| A6 Saloon TDI quattro 204PS (C9)204 PS · A7 · listed 2025 | Hybrid | 55.4 mpg | 133g | £200 | 32% |
| A6 Avart 45 TFSI quattro 265PS265 PS · A7 · listed 2025 | Hybrid | 36.2 mpg | 178g | £200 | 37% |
| A6 Saloon 45 TFSI quattro 265PS265 PS · A7 · listed 2025 | Hybrid | 37.2 mpg | 173g | £200 | 37% |
| A6 Avart 40 TFSI 204PS S Tronic204 PS · A7 · listed 2025 | Petrol | 37.7 mpg | 171g | £200 | 37% |
| A6 Avart TFSI 204PS (C9)204 PS · A7 · listed 2025 | Petrol | 39.8 mpg | 162g | £200 | 37% |
Economy and CO2 are official WLTP figures. Car tax is the yearly rate at current rates for a car first registered in the year listed, before any expensive car supplement. Company car tax is the 2026/27 benefit-in-kind rate. Showing the 15 most recent of 483 versions.
What a Audi A6 costs to fuel
- petrol, typical official 39.8mpg…
- diesel, typical official 62.8mpg…
- Electric, typical official 4 miles per kWh…
Official figures are usually 10–15% better than real-world driving.
Work out your charging costsWork out a journey in a Audi A6Buying a used Audi A6?
Check the MOT history of the exact car: every result, advisory and mileage reading, free.
Compare the Audi A6 with other executive cars
Reliability, economy, car tax and running costs side by side.
Other Audi models
Frequently asked questions
›Is the Audi A6 reliable?
Its MOT record is better than average: the Audi A6 is 35% less likely to fail than the average car of the same age and mileage, with a reliability score of 155 in our 2024 league (100 is average).
›What are common problems with the Audi A6?
The most common MOT fault is “Tread depth: tread depth below requirements of 1.6mm”, found in 2.9% of tests.
›How big is the Audi A6's boot?
The C9 (2025–) Audi A6 has 492 litres of boot space with the rear seats up, according to the manufacturer. That's the 3rd biggest of the 8 executive cars we compare; the Mercedes-Benz E-Class has the most, at 540 litres.
›What MPG does the Audi A6 do?
Official economy for the Audi A6 ranges from 19.3 to 67.3mpg across the 483 versions listed by the Vehicle Certification Agency (2004–2025). A typical petrol version manages 39.8mpg and a typical diesel 62.8mpg. Electric versions average 4 miles per kWh, with an official range of 329 to 462 miles. Expect 10–15% less in real-world driving.
›How much is road tax on a Audi A6?
Any Audi A6 first registered from April 2017 pays the standard rate of £200 a year after its first year (2026/27 rates). A Audi A6 registered between March 2001 and March 2017 is taxed on its CO2: £20 to £790 a year.
›How many Audi A6s fail their MOT?
20.9% of Audi A6s aged 3 to 20 failed their MOT first time in 2024, and 9.5% failed at their first MOT.
Sources: DVSA anonymised MOT tests 2024, all versions of the Audi A6 combined (Open Government Licence v3.0); official economy and CO2 from Vehicle Certification Agency data, © Crown copyright. VCA cannot accept liability for its accuracy. How we calculate the league.