2021 Audi A3 1.5 TFSI S Line
Price: £18,463. Fair price: £352 (1%) over the AskCar estimate of £18,111, 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: 1.5 TFSI 35 S Line S tronic FWD Euro 6 (s/s) 4dr (148 bhp)
- Year: 2021
- Mileage: 44,306 miles
- Fuel: Petrol, mild hybrid
- Body: Saloon, 4 doors, 5 seats
- Engine: 1.5 litres, 148 bhp
- Gearbox: Automatic (S tronic)
- Drive: Front-wheel drive
- Colour: Grey
- CO2: 131 g/km
- Emissions standard: Euro 6, ULEZ compliant
About this car
The advertised mileage for this 2021 Audi A3 S Line is 44,306 miles. Priced at £18,463, it is advertised £352 above the AskCar estimate of £18,111. The AskCar estimate uses 6,542 UK dealer adverts for the Audi A3, with adjustments for age, mileage, trim, engine and other specifications. It first appeared in our advert records today. According to the government's MOT record, its advertised mileage is consistent with the latest test. It is advertised by Lookers Audi Wearside in Sunderland. How to contact the dealer and its opening hours are on this AskCar page.
Stock data as of 2 November 2026.
Price
Fair price: £352 (1%) over the AskCar estimate of £18,111.
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 1.5 petrol engine is typically advertised at £18,000: the median of the 191 for sale on AskCar, as of 2 November 2026.
Time on sale
AskCar first saw this 2021 Audi A3 advertised today. 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 2 November 2026 at £18,463. 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 2 November 2026: valid until 29 January 2027.
It has had 3 MOTs. The latest, on 2 January 2026, passed.
There were no advisories at the latest test.
Mileage at that test: 37,021 miles, which matches the advertised 44,306 miles.
Advertised mileage is about 700 miles higher than the median mileage of a 2021 Audi A3 on AskCar.
Similar cars
31 other 2021 Audi A3 S Line 1.5 petrol automatic saloons are for sale at UK dealers, from £11,995 to £20,995, as of 2 November 2026.
The 3 closest to this car in mileage:
- 2021 Audi A3 S Line, 1.5 petrol saloon, black. Mileage: 43,056 miles. Price: £17,230, £1,233 less than this car. Dealer: Evans Halshaw Ford Middlesbrough in Middlesbrough. AskCar page: https://askcar.co.uk/car/audi-a3-2021-b2308c40c33d
- 2021 Audi A3 S Line, 1.5 petrol saloon, black. Mileage: 42,005 miles. Price: £18,495, the same price as this car. Dealer: Ideal Car Centre in Bilston. AskCar page: https://askcar.co.uk/car/audi-a3-2021-e8fc33b343a6
- 2021 Audi A3 S Line, 1.5 petrol saloon, grey. Mileage: 41,349 miles. Price: £16,498, £1,965 less than this car. Dealer: Lookers Car Hub South Shields in South Shields. AskCar page: https://askcar.co.uk/car/audi-a3-2021-cd81b2494418
Browse all Audi A3 cars for sale · 2021 Audi A3 price guide
More like this
- Used Audi A3 S Line prices
- Used Audi A3 for sale under £20,000
- Used automatic Audi A3 for sale
- Used petrol Audi A3 for sale
- Used Audi A3 for sale near Sunderland
Photos
6 photos of this car are 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.