2021 Audi A3 2.0 TDI S Line
Price: £18,520. Fair price: £419 (2%) under the AskCar estimate of £18,939, our expected asking price for this car from its model, age, mileage and specification, drawing on 6,542 priced Audi A3 adverts on AskCar as of 2 November 2026.
AskCar lists 6,720 used Audi A3 from 2,302 UK dealerships, as of 2 November 2026.
Overview
- Make: Audi
- Model: A3
- Trim: S Line
- Version: 2.0 TDI 35 S Line S tronic FWD Euro 6 (s/s) 5dr Sportback (148 bhp)
- Year: 2021
- Mileage: 42,232 miles
- Fuel: Diesel
- Body: Hatchback, 5 doors, 5 seats
- Engine: 2.0 litres, 148 bhp
- Gearbox: Automatic (S tronic)
- Drive: Front-wheel drive
- Colour: White
- CO2: 127 g/km
- Emissions standard: Euro 6, ULEZ compliant
About this car
This 2021 Audi A3 S Line has covered 42,232 miles. Its asking price of £18,520 is £419 below the AskCar estimate of £18,939. The AskCar estimate draws on 6,542 Audi A3 adverts across the UK, adjusting for age, mileage, trim, engine and other specifications. This car was first seen in our listings data 2 days ago. The seller is Vertu Audi Hereford, based in Hereford. How to contact the dealer and its opening hours are on this AskCar page.
Stock data as of 2 November 2026.
Price
Fair price: £419 (2%) under the AskCar estimate of £18,939.
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 6,542 priced Audi A3 adverts across different ages and specifications, as of 2 November 2026.
A 2021 Audi A3 with the 2.0 diesel engine is typically advertised at £17,400: the median of the 45 for sale on AskCar, as of 2 November 2026.
Time on sale
AskCar first saw this 2021 Audi A3 advertised 2 days ago. About 6 in 10 of 2021 Audi A3 cars are gone from sale within a month of being advertised: 403 of the 709 first advertised between 7 July 2026 and 29 September 2026.
Price history
AskCar first saw this advert on 31 October 2026 at £18,520. Its asking price has not changed.
Mileage and MOT
Advertised mileage is about 1,400 miles lower than the median mileage of a 2021 Audi A3 on AskCar.
Similar cars
6 other 2021 Audi A3 S Line 2.0 diesel automatic hatchbacks are for sale at UK dealers, from £15,950 to £18,500, as of 2 November 2026.
The 3 closest to this car in mileage:
- 2021 Audi A3 S Line, 2.0 diesel hatchback, white. Mileage: 43,744 miles. Price: £18,000, £520 less than this car. Dealer: Sytner Group West London Audi in London. AskCar page: https://askcar.co.uk/car/audi-a3-2021-faa149fc5438
- 2021 Audi A3 S Line, 2.0 diesel hatchback, black. Mileage: 44,495 miles. Price: £17,490, £1,030 less than this car. Dealer: Barlow Motors Crewe Skoda in Crewe. AskCar page: https://askcar.co.uk/car/audi-a3-2021-ea0fc4041912
- 2021 Audi A3 S Line, 2.0 diesel hatchback, white. Mileage: 45,833 miles. Price: £17,400, £1,120 less than this car. Dealer: Essex Car Company in Rainham. AskCar page: https://askcar.co.uk/car/audi-a3-2021-05a9f027fafc
Browse all Audi A3 cars for sale · 2021 Audi A3 price guide
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- Used Audi A3 for sale near Hereford
Photos
1 photo of this car is on its AskCar page.
As of 2 November 2026, AskCar lists 586,270 cars and vans from 12,920 UK dealerships, read daily from dealer websites: over 99% of UK dealer used car adverts. No dealer pays to be listed.