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: 44,514 miles
• Fuel: Diesel
• Body: Saloon, 4 doors, 5 seats
• Engine: 2.0 litres, 160 bhp
• Gearbox: Automatic (S tronic)
• Drive: Front-wheel drive
• Colour: Black
• CO2: 137 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

With 44,514 miles on the clock, this 2021 Audi A4 S Line has done roughly 5,700 fewer miles than a typical 2021 Audi A4. Priced at £17,599, it is advertised £791 below the AskCar estimate of £18,390. To work out the AskCar estimate, we analyse UK dealer adverts for 1,427 Audi A4 cars across different ages and specifications. The asking price is now £800 lower than when we first recorded the advert 21 days ago. According to the government's MOT record, its advertised mileage is consistent with the latest test. The seller is Motorpoint Birtley, based in Birtley. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 4 November 2026.

How we estimate prices and check cars

Price

Fair price: £791 (4%) under the AskCar estimate of £18,390.

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 1,427 priced Audi A4 adverts across different ages and specifications, as of 4 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 4 November 2026.

Time on sale

This 2021 Audi A4 has been on sale for at least 21 days.

Price history

AskCar first saw this advert on 14 October 2026 at £18,399. Its asking price is now £17,599, £800 less. The latest price cut was seen on 3 November 2026.

Price changes recorded:

• 14 October 2026: £18,399
• 17 October 2026: £17,699
• 20 October 2026: £17,749
• 22 October 2026: £17,799
• 27 October 2026: £17,849
• 3 November 2026: £17,599

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 4 November 2026: valid until 31 August 2027.

It has had 3 MOTs. The latest, on 1 September 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 43,551 miles, which matches the advertised 44,514 miles.

Advertised mileage is about 5,700 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 4 November 2026.

The 3 closest to this car in mileage:

• 2021 Audi A4 S Line, 2.0 diesel saloon, blue. Mileage: 38,930 miles. Price: £18,299, £700 more 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: 50,200 miles. Price: £17,495, £104 less than this car. Dealer: Evolve Motor Company in Newport. AskCar page: https://askcar.co.uk/car/audi-a4-2021-845a08389f20
• 2021 Audi A4 S Line, 2.0 diesel saloon, blue. Mileage: 37,000 miles. Price: £17,995, £396 more than this car. Dealer: Auto 2000 in Havering. AskCar page: https://askcar.co.uk/car/audi-a4-2021-6e30f932d50e

• The nearest: 2021 Audi A4 S Line, 2.0 diesel saloon, black, 79 miles from this car. Mileage: 55,966 miles. Price: £16,999, £600 less than this car. Dealer: Bridgend Motor Group in Morley. AskCar page: https://askcar.co.uk/car/audi-a4-2021-ac0d199c23d4