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: 89,000 miles
• Fuel: Diesel
• Body: Estate, 5 doors, 5 seats
• Engine: 2.0 litres, 201 bhp
• Gearbox: Automatic (S tronic)
• Drive: Front-wheel drive
• Colour: Grey
• CO2: 150 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 Audi A6 Avant S Line is advertised with 89,000 miles, approximately 37,400 above the typical mileage for its age. Priced at £18,491, it is advertised £551 above the AskCar estimate of £17,940. The AskCar estimate uses UK dealer asking prices, including 785 Audi A6 Avant adverts, and accounts for the car’s age, mileage and specification. It first appeared in our advert records 15 days ago. According to the government's MOT record, its advertised mileage is consistent with the latest test. It is for sale at Sapphire Motors in Mill Hill. 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: £551 (3%) over the AskCar estimate of £17,940.

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 15 days.

Price history

AskCar first saw this advert on 21 October 2026 at £18,491. 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 5 November 2026: valid until 24 September 2027.

It has had 3 MOTs. The latest, on 25 September 2026, passed.

Advisories at the latest test: offside front tyre worn close to legal limit/worn on edge 3mm.

Mileage at that test: 88,820 miles, which matches the advertised 89,000 miles.

Advertised mileage is about 37,400 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 £19,640 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, red. Mileage: 86,000 miles. Price: £19,995, £1,504 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, white. Mileage: 69,000 miles. Price: £22,395, £3,904 more than this car. Dealer: MC Autosales in Magherafelt. AskCar page: https://askcar.co.uk/car/audi-a6-avant-2021-20a37b0c61d7
• 2021 Audi A6 Avant S Line, 2.0 diesel estate, white. Mileage: 65,348 miles. Price: £19,640, £1,149 more than this car. Dealer: Riverside Volvo Wakefield in Wakefield. AskCar page: https://askcar.co.uk/car/audi-a6-avant-2021-936bbc4d7e07

• The nearest: 2021 Audi A6 Avant S Line, 2.0 diesel estate, black, 23 miles from this car. Mileage: 55,920 miles. Price: £21,695, £3,204 more than this car. Dealer: Stratstone Hitchin Audi in Hitchin. AskCar page: https://askcar.co.uk/car/audi-a6-avant-2021-24c1afb209f4