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: 46,478 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: Blue
• CO2: 142 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

At 46,478 miles, this 2021 Audi A4 Avant S Line has covered about 11,500 fewer miles than other 2021 Audi A4 Avant cars. Its asking price of £18,820 is £1,229 below the AskCar estimate of £20,049. The AskCar estimate uses 1,256 UK dealer adverts for the Audi A4 Avant, with adjustments for age, mileage, trim, engine and other specifications. We first saw this car advertised 6 days ago. Its asking price has since fallen by £120. The government's MOT record matches its advertised mileage. It is for sale at Big Motoring World Blue Bell Hill in Chatham. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 6 November 2026.

How we estimate prices and check cars

Price

Fair price: £1,229 (6%) under the AskCar estimate of £20,049.

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 1,256 priced Audi A4 Avant adverts across different ages and specifications, as of 6 November 2026.

A 2021 Audi A4 Avant with the 2.0 diesel engine is typically advertised at £18,400: the median of the 95 for sale on AskCar, as of 6 November 2026.

Time on sale

AskCar first saw this 2021 Audi A4 Avant advertised 6 days ago. About half of 2021 Audi A4 Avant cars are gone from sale within a month of being advertised: 50 of the 111 first advertised between 11 July 2026 and 3 October 2026.

Price history

AskCar first saw this advert on 31 October 2026 at £18,940. Its asking price is now £18,820, £120 less. The latest price cut was seen on 6 November 2026.

Price changes recorded:

• 31 October 2026: £18,940
• 1 November 2026: £18,890
• 3 November 2026: £18,870
• 5 November 2026: £18,880
• 6 November 2026: £18,820

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 6 November 2026: valid until 2 March 2027.

It failed its MOT on 23 February 2026 (offside front tyre tread depth below requirements of 1.6mm; nearside rear tyre tread depth below requirements of 1.6mm; offside rear tyre has a bulge, caused by separation or partial failure of its structure) and passed 1 day later, on 24 February 2026.

Advisories at the latest test: rear registration plate deteriorated but not likely to be misread.

Mileage at that test: 42,604 miles, which matches the advertised 46,478 miles.

Advertised mileage is about 11,500 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 6 November 2026.

The 3 closest to this car in mileage:

• 2021 Audi A4 Avant S Line, 2.0 diesel estate, black. Mileage: 42,000 miles. Price: £19,990, £1,170 more than this car. Dealer: Stratus in Basingstoke. AskCar page: https://askcar.co.uk/car/audi-a4-avant-2021-5c4e0c48c174
• 2021 Audi A4 Avant S Line, 2.0 diesel estate, black. Mileage: 40,699 miles. Price: £19,995, £1,175 more 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, white. Mileage: 54,820 miles. Price: £17,995, £825 less than this car. Dealer: P W Millar Ford in Barry. AskCar page: https://askcar.co.uk/car/audi-a4-avant-2021-a5badf95220c

• The nearest: 2021 Audi A4 Avant S Line, 2.0 diesel estate, grey, 46 miles from this car. Mileage: 18,925 miles. Price: £22,000, £3,180 more than this car. Dealer: Car Planet Watford in Watford. AskCar page: https://askcar.co.uk/car/audi-a4-avant-2021-2fefde6aefd5