2021 Audi A6 Saloon 2.0 TDI S Line

Overview

• Make: Audi
• Model: A6 Saloon
• Trim: S Line
• Version: 2.0 TDI S Line S tronic FWD Euro 6 4dr 40 (201 bhp)
• Year: 2021
• Mileage: 79,921 miles
• Fuel: Diesel
• Body: Saloon, 4 doors, 5 seats
• Engine: 2.0 litres, 201 bhp
• Gearbox: Automatic (S tronic)
• Drive: Front-wheel drive
• Colour: Black
• CO2: 142 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

With 79,921 miles on the clock, this 2021 Audi A6 Saloon S Line has done roughly 22,900 more miles than a typical 2021 Audi A6 Saloon. The dealer is asking £16,400, which is £1,220 below the AskCar estimate of £17,620. To work out the AskCar estimate, we analyse UK dealer adverts for 858 Audi A6 Saloon cars across different ages and specifications. We first saw this car advertised 135 days ago. Its asking price has since fallen by £590. According to the government's MOT record, its advertised mileage is consistent with the latest test. You can find this car at Carworld Car Supermarket in Peterborough. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 2 November 2026.

How we estimate prices and check cars

Price

Fair price: £1,220 (6%) under the AskCar estimate of £17,620.

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 858 priced Audi A6 Saloon adverts across different ages and specifications, as of 2 November 2026.

A 2021 Audi A6 Saloon with the 2.0 diesel engine is typically advertised at £18,500: the median of the 80 for sale on AskCar, as of 2 November 2026.

Time on sale

This 2021 Audi A6 Saloon has been on sale for at least 135 days.

Price history

AskCar first saw this advert on 20 June 2026 at £16,990. Its asking price is now £16,400, £590 less. The latest price cut was seen on 30 October 2026.

Price changes recorded:

• 20 June 2026: £16,990
• 21 July 2026: £17,400
• 22 September 2026: £16,990
• 12 October 2026: £16,700
• 30 October 2026: £16,400

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 2 November 2026: valid until 4 June 2027.

It failed its MOT on 26 May 2026 (front service brake excessively fluctuating; offside rear lower coil spring mounting corroded and seriously weakened; nearside rear lower coil spring mounting corroded and seriously weakened; and 2 more) and passed 10 days later, on 5 June 2026.

There were no advisories at the latest test.

Mileage at that test: 79,918 miles, which matches the advertised 79,921 miles.

Advertised mileage is about 22,900 miles higher than the median mileage of a 2021 Audi A6 Saloon on AskCar.

Similar cars

14 other 2021 Audi A6 Saloon S Line 2.0 diesel automatic saloons are for sale at UK dealers, from £15,770 to £21,000, as of 2 November 2026.

The 3 closest to this car in mileage:

• 2021 Audi A6 Saloon S Line, 2.0 diesel saloon, white. Mileage: 82,000 miles. Price: £18,000, £1,600 more than this car. Dealer: Alistair Buchan in East Wemyss. AskCar page: https://askcar.co.uk/car/audi-a6-saloon-2021-5f385f15c136
• 2021 Audi A6 Saloon S Line, 2.0 diesel saloon, black. Mileage: 82,640 miles. Price: £18,495, £2,095 more than this car. Dealer: Comiskey Motors in Newry. AskCar page: https://askcar.co.uk/car/audi-a6-saloon-2021-db6063569ca9
• 2021 Audi A6 Saloon S Line, 2.0 diesel saloon, blue. Mileage: 75,378 miles. Price: £17,699, £1,299 more than this car. Dealer: cinch Corby in Corby. AskCar page: https://askcar.co.uk/car/audi-a6-saloon-2021-b239d25d51d8

• The nearest: 2021 Audi A6 Saloon S Line, 2.0 diesel saloon, black, 3 miles from this car. Mileage: 97,450 miles. Price: £16,495, £95 more than this car. Dealer: Select Car Superstore in Peterborough. AskCar page: https://askcar.co.uk/car/audi-a6-saloon-2021-0797fd159c88