2021 Audi A4 2.0 TDI S Line

Overview

• Make: Audi
• Model: A4
• Trim: S Line
• Version: 2.0 TDI S Line S tronic FWD Euro 6 4dr (160 bhp)
• Year: 2021
• Mileage: 36,347 miles
• Fuel: Diesel
• Body: Saloon, 4 doors, 5 seats
• Engine: 2.0 litres, 160 bhp
• Gearbox: Automatic (S tronic)
• Drive: Front-wheel drive
• Colour: Grey
• CO2: 137 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 Audi A4 S Line has covered 36,347 miles, around 13,900 fewer miles than is typical for its age. Priced at £19,495, it is advertised £204 above the AskCar estimate of £19,291. To work out the AskCar estimate, we analyse UK dealer adverts for 1,428 Audi A4 cars across different ages and specifications. We first recorded this car for sale 1 day ago. According to the government's MOT record, its advertised mileage is consistent with the latest test. The seller is Lookers Audi Hamilton, based in Hamilton. 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: £204 (1%) over the AskCar estimate of £19,291.

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 1,428 priced Audi A4 adverts across different ages and specifications, as of 2 November 2026.

A 2021 Audi A4 with the 2.0 diesel engine is typically advertised at £17,100: the median of the 95 for sale on AskCar, as of 2 November 2026.

Time on sale

AskCar first saw this 2021 Audi A4 advertised 1 day ago. About half of 2021 Audi A4 cars are gone from sale within a month of being advertised: 57 of the 115 first advertised between 11 July 2026 and 29 September 2026.

Price history

AskCar first saw this advert on 1 November 2026 at £19,495. 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 2 November 2026: valid until 5 May 2027.

It has had 3 MOTs. The latest, on 30 April 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 32,476 miles, which matches the advertised 36,347 miles.

Advertised mileage is about 13,900 miles lower than the median mileage of a 2021 Audi A4 on AskCar.

Similar cars

16 other 2021 Audi A4 S Line 2.0 diesel automatic saloons are for sale at UK dealers, from £12,995 to £20,495, as of 2 November 2026.

The 3 closest to this car in mileage:

• 2021 Audi A4 S Line, 2.0 diesel saloon, blue. Mileage: 37,000 miles. Price: £17,995, £1,500 less than this car. Dealer: Auto 2000 in Havering. AskCar page: https://askcar.co.uk/car/audi-a4-2021-6e30f932d50e
• 2021 Audi A4 S Line, 2.0 diesel saloon, blue. Mileage: 38,930 miles. Price: £18,299, £1,196 less than this car. Dealer: Motorpoint Edinburgh in Edinburgh. AskCar page: https://askcar.co.uk/car/audi-a4-2021-3eec8a99717c
• 2021 Audi A4 S Line, 2.0 diesel saloon, black. Mileage: 44,514 miles. Price: £17,849, £1,646 less than this car. Dealer: Motorpoint Birtley in Birtley. AskCar page: https://askcar.co.uk/car/audi-a4-2021-7bbc75ccb0eb

• The nearest: 2021 Audi A4 S Line, 2.0 diesel saloon, white, 11 miles from this car. Mileage: 69,960 miles. Price: £15,498, £3,997 less than this car. Dealer: Arnold Clark Cumbernauld Kia in Cumbernauld. AskCar page: https://askcar.co.uk/car/audi-a4-2021-f489aca9ff93