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 4WD Euro 6 5dr (201 bhp)
• Year: 2021
• Mileage: 85,342 miles
• Fuel: Diesel
• Body: Estate, 5 doors, 5 seats
• Engine: 2.0 litres, 201 bhp
• Gearbox: Automatic (S tronic)
• Drive: Four-wheel drive
• Colour: Grey
• CO2: 152 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 Audi A6 Avant S Line is advertised with 85,342 miles, approximately 34,700 above the typical mileage for its age. Priced at £18,200, it is advertised £691 below the AskCar estimate of £18,891. The AskCar estimate uses UK dealer asking prices, including 779 Audi A6 Avant adverts, and accounts for the car’s age, mileage and specification. This car was first seen in our listings data today. The government's MOT record matches its advertised mileage. You can find this car at Traxler's Auto in Swanley. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 11 November 2026.

How we estimate prices and check cars

Price

Fair price: £691 (3%) under the AskCar estimate of £18,891.

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 779 priced Audi A6 Avant adverts across different ages and specifications, as of 11 November 2026.

A 2021 Audi A6 Avant with the 2.0 diesel engine is typically advertised at £22,700: the median of the 36 for sale on AskCar, as of 11 November 2026.

Time on sale

AskCar first saw this 2021 Audi A6 Avant advertised today. About 6 in 10 of 2021 Audi A6 Avant cars are gone from sale within a month of being advertised: 37 of the 65 first advertised between 13 July 2026 and 8 October 2026.

Price history

AskCar first saw this advert on 11 November 2026 at £18,200. Its asking price has not changed.

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 11 November 2026: valid until 18 March 2027.

It has had 3 MOTs. The latest, on 13 March 2026, passed.

Advisories at the latest test: nearside front inner tyre worn close to legal limit/worn on edge; offside front inner tyre worn close to legal limit/worn on edge.

Mileage at that test: 80,923 miles, which matches the advertised 85,342 miles.

Advertised mileage is about 34,700 miles higher than the median mileage of a 2021 Audi A6 Avant on AskCar.

Similar cars

11 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 11 November 2026.

The 3 closest to this car in mileage:

• 2021 Audi A6 Avant S Line, 2.0 diesel estate, red. Mileage: 86,000 miles. Price: £19,995, £1,795 more than this car. Dealer: MC Autosales in Magherafelt. AskCar page: https://askcar.co.uk/car/audi-a6-avant-2021-f69cdf96f716
• 2021 Audi A6 Avant S Line, 2.0 diesel estate, grey. Mileage: 89,000 miles. Price: £18,491, £291 more than this car. Dealer: Sapphire Motors in London. AskCar page: https://askcar.co.uk/car/audi-a6-avant-2021-90bc35dd3e02
• 2021 Audi A6 Avant S Line, 2.0 diesel estate, white. Mileage: 69,000 miles. Price: £22,395, £4,195 more than this car. Dealer: MC Autosales in Magherafelt. AskCar page: https://askcar.co.uk/car/audi-a6-avant-2021-20a37b0c61d7