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: 42,000 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

This 2021 Audi A4 Avant S Line has covered 42,000 miles, around 17,700 fewer miles than is typical for its age. The AskCar estimate for this car is £20,618. It is priced at £20,290, which is £328 below that estimate. The AskCar estimate uses 1,232 UK dealer adverts for the Audi A4 Avant, with adjustments for age, mileage, trim, engine and other specifications. We first saw this car advertised 146 days ago. Its asking price has since fallen by £1,200. Our latest MOT record expired on 13 June 2026. Check the current position with the dealer. We checked its advertised mileage against the government's MOT record, and they match. You can find this car at Stratus in Hook. 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: £328 (1%) under the AskCar estimate of £20,618.

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 146 days.

Price history

AskCar first saw this advert on 11 June 2026 at £21,490. Its asking price is now £20,290, £1,200 less. The latest price cut was seen on 9 October 2026.

Price changes recorded:

• 10 July 2026: £21,490
• 28 August 2026: £20,990
• 18 September 2026: £20,490
• 9 October 2026: £20,290

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 4 November 2026: the latest record we hold ran out on 13 June 2026; ask the dealer for the current MOT.

It has had 2 MOTs. The latest, on 29 May 2025, passed.

There were no advisories at the latest test.

Mileage at that test: 34,734 miles, which matches the advertised 42,000 miles.

Advertised mileage is about 17,700 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, black. Mileage: 40,699 miles. Price: £19,995, £295 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, blue. Mileage: 46,478 miles. Price: £18,870, £1,420 less 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
• 2021 Audi A4 Avant S Line, 2.0 diesel estate, black. Mileage: 37,348 miles. Price: £22,000, £1,710 more than this car. Dealer: Sytner Group Nottingham Audi in Nottingham. AskCar page: https://askcar.co.uk/car/audi-a4-avant-2021-fdc420d540c4

• The nearest: 2021 Audi A4 Avant S Line, 2.0 diesel estate, white, 3 miles from this car. Mileage: 89,277 miles. Price: £14,999, £5,291 less than this car. Dealer: cinch Bellevue in Hook. AskCar page: https://askcar.co.uk/car/audi-a4-avant-2021-be96804773ba