2021 Audi A3 2.0 TDI S Line
Version: 2.0 TDI 35 S Line S tronic FWD Euro 6 (s/s) 5dr Sportback (148 bhp)
Price: £18,520. Fair price: £408 (2%) under the AskCar estimate of £18,928, our expected asking price for this car from its model, age, mileage and specification, drawing on 6,600 priced Audi A3 adverts on AskCar as of 31 October 2026.
AskCar lists 6,729 used Audi A3 from 2,260 UK dealerships, as of 31 October 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)
- Mileage
- 42,232 miles
- Year
- 2021
- Fuel type
- Diesel
- Body type
- Hatchback
- Engine
- 2.0 L
- Gearbox
- Automatic
- Power
- 148 bhp
- Seats
- 5
- CO2
- 127 g/km
- Colour
- White
- Doors
- 5
- Driven wheels
- Front Wheel Drive
- Gearbox version
- S tronic
- Engine badge
- TDI
- Emissions standard
- Euro 6
About this car
This 2021 Audi A3 S Line has covered 42,232 miles. Its asking price of £18,520 is £408 below the AskCar estimate of £18,928. The AskCar estimate draws on 6,600 Audi A3 adverts across the UK, adjusting for age, mileage, trim, engine and other specifications. It first appeared in our advert records today. The seller is Vertu Audi Hereford, based in Hereford.
Stock data as of 31 October 2026.
Price history
AskCar first saw this advert on 31 October 2026.
| Date observed | Asking price |
|---|---|
| 31 October 2026 | £18,520 |
Price and mileage comparison
Fair price: £408 (2%) under the AskCar estimate of £18,928.
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 6,600 priced Audi A3 adverts across different ages and specifications, as of 31 October 2026.
Advertised mileage is about 1,100 miles lower than the median mileage of a 2021 Audi A3 on AskCar.
Other matching cars
10 other 2021 Audi A3 S Line automatic diesel cars are for sale at UK dealers from £15,650 to £18,950, as of 31 October 2026.
The 5 cheapest:
- 2021 Audi A3. Price: £15,650. Mileage: 63,113 miles. Dealer: Stoneacre in Peterborough. AskCar page: https://askcar.co.uk/car/audi-a3-2021-fad3c596abe9
- 2021 Audi A3. Price: £15,950. Mileage: 93,000 miles. Dealer: MC Autosales in Magherafelt. AskCar page: https://askcar.co.uk/car/audi-a3-2021-60423bfb94a1
- 2021 Audi A3. Price: £15,995. Mileage: 71,923 miles. Dealer: S & R Motors in Swindon. AskCar page: https://askcar.co.uk/car/audi-a3-2021-e7ef4cf5aa43
- 2021 Audi A3. Price: £16,550. Mileage: 50,311 miles. Dealer: Big Motoring World Blue Bell Hill in Blue Bell Hill. AskCar page: https://askcar.co.uk/car/audi-a3-2021-b7a4c48f1a83
- 2021 Audi A3. Price: £16,950. Mileage: 36,250 miles. Dealer: Group 1 Automotive Watford Audi in Watford. AskCar page: https://askcar.co.uk/car/audi-a3-2021-c91e9540ac3c
The 10 matching cars have covered 25,000 to 93,000 miles, compared with 42,232 miles for this car.
Matching year, trim, gearbox and fuel does not mean matching mileage or every specification. The AskCar estimate adjusts for these differences.
Browse all Audi A3 cars for sale · 2021 Audi A3 price guide
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Photos
1 photo of this car is on its AskCar page.
How to contact the dealer and its opening hours are on this AskCar page.
As of 31 October 2026, AskCar lists 583,548 cars and vans from 12,716 UK dealerships, read daily from dealer websites: over 99% of UK dealer used car adverts. No dealer pays to be listed.