2021 Audi A6 Avant 2.0 TDI S Line

Overview

• Make: Audi
• Model: A6 Avant
• Trim: S Line
• Version: 2.0 TDI S Line S tronic FWD Euro 6 5dr (201 bhp)
• Year: 2021
• Mileage: 55,920 miles
• Fuel: Diesel
• Body: Estate, 5 doors, 5 seats
• Engine: 2.0 litres, 201 bhp
• Gearbox: Automatic (S tronic)
• Drive: Front-wheel drive
• Colour: Black
• CO2: 149 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

At 55,920 miles, this 2021 Audi A6 Avant S Line has covered about 4,300 more miles than other 2021 Audi A6 Avant cars. The dealer is asking £21,695, which is £1,029 below the AskCar estimate of £22,724. To work out the AskCar estimate, we analyse UK dealer adverts for 785 Audi A6 Avant cars across different ages and specifications. Since we first spotted the advert 37 days ago, the asking price has dropped by £255. We checked its advertised mileage against the government's MOT record, and they match. The seller is Stratstone Hitchin Audi, based in Hitchin. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 5 November 2026.

How we estimate prices and check cars

Price

Fair price: £1,029 (4%) under the AskCar estimate of £22,724.

The AskCar estimate is our expected asking price for this car. It uses UK dealer asking prices, accounting for make, model, trim, version, age, mileage, fuel, gearbox, body type, driven wheels, engine size and power. It is an advertised price, not a confirmed sale price.

It draws on 785 priced Audi A6 Avant adverts across different ages and specifications, as of 5 November 2026.

A 2021 Audi A6 Avant with the 2.0 diesel engine is typically advertised at £22,400: the median of the 37 for sale on AskCar, as of 5 November 2026.

Time on sale

This 2021 Audi A6 Avant has been on sale for at least 37 days.

Price history

AskCar first saw this advert on 29 September 2026 at £21,950. Its asking price is now £21,695, £255 less. The latest price cut was seen on 22 October 2026.

Price changes recorded:

• 29 September 2026: £21,950
• 8 October 2026: £21,450
• 16 October 2026: £21,850
• 22 October 2026: £21,670
• 30 October 2026: £21,695

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 5 November 2026: valid until 22 June 2027.

It has had 4 MOTs. The latest, on 19 June 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 49,656 miles, which matches the advertised 55,920 miles.

Advertised mileage is about 4,300 miles higher than the median mileage of a 2021 Audi A6 Avant on AskCar.

Similar cars

8 other 2021 Audi A6 Avant S Line 2.0 diesel automatic estates are for sale at UK dealers, from £18,491 to £25,995, as of 5 November 2026.

The 3 closest to this car in mileage:

• 2021 Audi A6 Avant S Line, 2.0 diesel estate, grey. Mileage: 54,341 miles. Price: £21,990, £295 more than this car. Dealer: Brownroyd Motors in Heywood. AskCar page: https://askcar.co.uk/car/audi-a6-avant-2021-bc975a828b44
• 2021 Audi A6 Avant S Line, 2.0 diesel estate, black. Mileage: 51,313 miles. Price: £22,990, £1,295 more than this car. Dealer: Malt Mill Motors in Nottingham. AskCar page: https://askcar.co.uk/car/audi-a6-avant-2021-68090e29dd0b
• 2021 Audi A6 Avant S Line, 2.0 diesel estate, white. Mileage: 49,315 miles. Price: £21,999, £304 more than this car. Dealer: Fresh Motors in Watton. AskCar page: https://askcar.co.uk/car/audi-a6-avant-2021-06b2368d3dba

• The nearest: 2021 Audi A6 Avant S Line, 2.0 diesel estate, grey, 23 miles from this car. Mileage: 89,000 miles. Price: £18,491, £3,204 less than this car. Dealer: Sapphire Motors in London. AskCar page: https://askcar.co.uk/car/audi-a6-avant-2021-90bc35dd3e02