2021 Audi A4 Avant 2.0 TDI S Line

Overview

• Make: Audi
• Model: A4 Avant
• Trim: S Line
• Version: 2.0 40 TDI S Line S tronic 4WD Euro 6 5dr (201 bhp)
• Year: 2021
• Mileage: 89,437 miles
• Fuel: Diesel, mild hybrid
• Body: Estate, 5 doors, 5 seats
• Engine: 2.0 litres, 201 bhp
• Gearbox: Automatic (S tronic)
• Drive: Four-wheel drive
• Colour: Black
• CO2: 151 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

At 89,437 miles, this 2021 Audi A4 Avant S Line has covered about 29,700 more miles than other 2021 Audi A4 Avant cars. The dealer is asking £18,500, which is £1,652 above the AskCar estimate of £16,848. To work out the AskCar estimate, we analyse UK dealer adverts for 1,232 Audi A4 Avant cars across different ages and specifications. This car was first seen in our listings data 40 days ago. We checked its advertised mileage against the government's MOT record, and they match. The seller is Jack Reid Cars, based in Carrickfergus. 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

Above the going rate: £1,652 (9%) over the AskCar estimate of £16,848.

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 40 days.

Price history

AskCar first saw this advert on 25 September 2026 at £18,500. 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 7 January 2027.

It has had 4 MOTs. The latest, on 19 December 2025, passed.

Advisories at the latest test: front brake pad(s) wearing thin.

Mileage at that test: 88,197 miles, which matches the advertised 89,437 miles.

Advertised mileage is about 29,700 miles higher 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: 89,277 miles. Price: £14,999, £3,501 less than this car. Dealer: cinch Bellevue in Hook. AskCar page: https://askcar.co.uk/car/audi-a4-avant-2021-be96804773ba
• 2021 Audi A4 Avant S Line, 2.0 diesel estate, blue. Mileage: 90,002 miles. Price: £14,800, £3,700 less than this car. Dealer: Marshall Volkswagen Newbury in Newbury. AskCar page: https://askcar.co.uk/car/audi-a4-avant-2021-90de791d49fe
• 2021 Audi A4 Avant S Line, 2.0 diesel estate, grey. Mileage: 82,481 miles. Price: £16,495, £2,005 less than this car. Dealer: Edinburgh Car Sales in Edinburgh. AskCar page: https://askcar.co.uk/car/audi-a4-avant-2021-ae9e93329907

• The nearest: 2021 Audi A4 Avant S Line, 2.0 diesel estate, white, 118 miles from this car. Mileage: 60,000 miles. Price: £17,987, £513 less than this car. Dealer: David Hayton Autostore Penrith in Penrith. AskCar page: https://askcar.co.uk/car/audi-a4-avant-2021-301c53af4bae