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: 52,755 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

This 2021 Audi A6 Saloon S Line has covered 52,755 miles, around 4,300 fewer miles than is typical for its age. Priced at £19,900, it is advertised £1,067 below the AskCar estimate of £20,967. The AskCar estimate draws on 858 Audi A6 Saloon adverts across the UK, adjusting for age, mileage, trim, engine and other specifications. We first recorded this advert 46 days ago, and its asking price has since fallen by £600. Its advertised mileage matches the government's MOT record. The seller is Sytner Select Swindon, based in Swindon. 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: £1,067 (5%) under the AskCar estimate of £20,967.

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 46 days.

Price history

AskCar first saw this advert on 17 September 2026 at £20,500. Its asking price is now £19,900, £600 less. The latest price cut was seen on 23 October 2026.

Price changes recorded:

• 17 September 2026: £20,500
• 15 October 2026: £20,200
• 23 October 2026: £19,900

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 2 November 2026: valid until 1 April 2027.

It has had 5 MOTs. The latest, on 2 April 2026, passed.

Advisories at the latest test: dash cam fitted to windscreen not adversely affecting drivers view.

Mileage at that test: 45,082 miles, which matches the advertised 52,755 miles.

Advertised mileage is about 4,300 miles lower 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, black. Mileage: 54,000 miles. Price: £21,000, £1,100 more than this car. Dealer: GMC Cars Online in Crawley. AskCar page: https://askcar.co.uk/car/audi-a6-saloon-2021-67b0f5f6c031
• 2021 Audi A6 Saloon S Line, 2.0 diesel saloon, grey. Mileage: 57,493 miles. Price: £19,500, £400 less than this car. Dealer: Big Motoring World Blue Bell Hill in Blue Bell Hill. AskCar page: https://askcar.co.uk/car/audi-a6-saloon-2021-6f5f3f711b1f
• 2021 Audi A6 Saloon S Line, 2.0 diesel saloon, silver. Mileage: 57,920 miles. Price: £21,000, £1,100 more than this car. Dealer: Sytner Group Huddersfield Audi in Huddersfield. AskCar page: https://askcar.co.uk/car/audi-a6-saloon-2021-66e67805c111

• The nearest: 2021 Audi A6 Saloon S Line, 2.0 diesel saloon, blue, 60 miles from this car. Mileage: 61,487 miles. Price: £17,795, £2,105 less than this car. Dealer: Tenby Car Supermarket in Luton. AskCar page: https://askcar.co.uk/car/audi-a6-saloon-2021-eb3afca4fd07