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: 37,348 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: Black
• CO2: 142 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

With 37,348 miles on the clock, this 2021 Audi A4 Avant S Line has done roughly 20,700 fewer miles than a typical 2021 Audi A4 Avant. Its asking price of £22,000 is £797 above the AskCar estimate of £21,203. To work out the AskCar estimate, we analyse UK dealer adverts for 1,251 Audi A4 Avant cars across different ages and specifications. It first appeared in our advert records 20 days ago. According to the government's MOT record, its advertised mileage is consistent with the latest test. The seller is Sytner Group Nottingham Audi, based in Nottingham. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 5 November 2026.

How we estimate prices and check cars

Price

Fair price: £797 (3%) over the AskCar estimate of £21,203.

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 1,251 priced Audi A4 Avant adverts across different ages and specifications, as of 5 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 5 November 2026.

Time on sale

This 2021 Audi A4 Avant has been on sale for at least 20 days.

Price history

AskCar first saw this advert on 16 October 2026 at £22,000. 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 5 November 2026: valid until 6 May 2027.

It failed its MOT on 24 April 2026 (windscreen damaged but not adversely affecting driver's view; nearside front tyre has ply or cords exposed) and passed later the same day.

Advisories at the latest test: windscreen damaged but not adversely affecting driver's view; offside rear tyre worn close to legal limit/worn on edge; nearside rear lower coil spring mounting corroded but not seriously weakened; and 1 more.

Mileage at that test: 34,243 miles, which matches the advertised 37,348 miles.

Advertised mileage is about 20,700 miles lower than the median mileage of a 2021 Audi A4 Avant on AskCar.

Similar cars

19 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 5 November 2026.

The 3 closest to this car in mileage:

• 2021 Audi A4 Avant S Line, 2.0 diesel estate, blue. Mileage: 35,650 miles. Price: £20,995, £1,005 less than this car. Dealer: Rodden Road Cars in Frome. AskCar page: https://askcar.co.uk/car/audi-a4-avant-2021-a059a41f72c2
• 2021 Audi A4 Avant S Line, 2.0 diesel estate, black. Mileage: 40,699 miles. Price: £19,995, £2,005 less than this car. Dealer: Victoria Motors in Gillingham. AskCar page: https://askcar.co.uk/car/audi-a4-avant-2021-487ce2dc53ef
• 2021 Audi A4 Avant S Line, 2.0 diesel estate, black. Mileage: 42,000 miles. Price: £20,290, £1,710 less than this car. Dealer: Stratus in Basingstoke. AskCar page: https://askcar.co.uk/car/audi-a4-avant-2021-5c4e0c48c174

• The nearest: 2021 Audi A4 Avant S Line, 2.0 diesel estate, blue, 40 miles from this car. Mileage: 31,041 miles. Price: £19,793, £2,207 less than this car. Dealer: Carsa Cannock in Cannock. AskCar page: https://askcar.co.uk/car/audi-a4-avant-2021-0ba1228a6b50