2021 Audi A4 Avant 2.0 TDI S Line

Overview

• Make: Audi
• Model: A4 Avant
• Trim: S Line
• Version: 2.0 TDI S Line S tronic FWD Euro 6 5dr (160 bhp)
• Year: 2021
• Mileage: 54,820 miles
• Fuel: Diesel, mild hybrid
• Body: Estate, 5 doors, 5 seats
• Engine: 2.0 litres, 160 bhp
• Gearbox: Automatic (S tronic)
• Drive: Front-wheel drive
• Colour: White
• CO2: 142 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 Audi A4 Avant S Line has covered 54,820 miles, around 4,900 fewer miles than is typical for its age. The AskCar estimate for this car is £19,178. It is priced at £17,995, which is £1,183 below that estimate. To work out the AskCar estimate, we analyse UK dealer adverts for 1,232 Audi A4 Avant cars across different ages and specifications. It first appeared in our advert records 67 days ago. The government's MOT record matches its advertised mileage. It is advertised by P W Millar Ford in Barry. 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: £1,183 (6%) under the AskCar estimate of £19,178.

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 1,232 priced Audi A4 Avant adverts across different ages and specifications, as of 4 November 2026.

A 2021 Audi A4 Avant with the 2.0 diesel engine is typically advertised at £18,500: the median of the 95 for sale on AskCar, as of 4 November 2026.

Time on sale

This 2021 Audi A4 Avant has been on sale for at least 67 days.

Price history

AskCar first saw this advert on 29 August 2026 at £17,995. 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 4 November 2026: valid until 28 January 2027.

It has had 4 MOTs. The latest, on 29 December 2025, passed.

There were no advisories at the latest test.

Mileage at that test: 53,684 miles, which matches the advertised 54,820 miles.

Advertised mileage is about 4,900 miles lower than the median mileage of a 2021 Audi A4 Avant on AskCar.

Similar cars

18 other 2021 Audi A4 Avant S Line 2.0 diesel automatic estates are for sale at UK dealers, from £8,999 to £22,000, as of 4 November 2026.

The 3 closest to this car in mileage:

• 2021 Audi A4 Avant S Line, 2.0 diesel estate, white. Mileage: 60,000 miles. Price: £17,987, the same price as this car. Dealer: David Hayton Autostore Penrith in Penrith. AskCar page: https://askcar.co.uk/car/audi-a4-avant-2021-301c53af4bae
• 2021 Audi A4 Avant S Line, 2.0 diesel estate, black. Mileage: 60,608 miles. Price: £18,149, £154 more than this car. Dealer: Second Chance Car Finance in Wetherby. AskCar page: https://askcar.co.uk/car/audi-a4-avant-2021-e62692a85e9d
• 2021 Audi A4 Avant S Line, 2.0 diesel estate, blue. Mileage: 46,478 miles. Price: £18,870, £875 more than this car. Dealer: Big Motoring World Blue Bell Hill in Blue Bell Hill. AskCar page: https://askcar.co.uk/car/audi-a4-avant-2021-316258fe9416

• The nearest: 2021 Audi A4 Avant S Line, 2.0 diesel estate, blue, 44 miles from this car. Mileage: 35,650 miles. Price: £20,995, £3,000 more than this car. Dealer: Rodden Road Cars in Frome. AskCar page: https://askcar.co.uk/car/audi-a4-avant-2021-a059a41f72c2