2021 Audi A3 1.5 TFSI S Line

Overview

• Make: Audi
• Model: A3
• Trim: S Line
• Version: 1.5 TFSI 35 S Line S tronic FWD Euro 6 (s/s) 5dr Sportback (148 bhp)
• Year: 2021
• Mileage: 21,684 miles
• Fuel: Petrol, mild hybrid
• Body: Hatchback, 5 doors, 5 seats
• Engine: 1.5 litres, 148 bhp
• Gearbox: Automatic (S tronic)
• Drive: Front-wheel drive
• Colour: White
• CO2: 135 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 Audi A3 S Line is advertised with 21,684 miles, approximately 21,900 below the typical mileage for its age. Priced at £19,799, it is advertised £402 below the AskCar estimate of £20,201. To work out the AskCar estimate, we analyse UK dealer adverts for 6,542 Audi A3 cars across different ages and specifications. Since we first spotted the advert 31 days ago, the asking price has dropped by £150. According to the government's MOT record, its advertised mileage is consistent with the latest test. The seller is Halliwell Jones Premium Trade Cars Southport, based in Southport. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 2 November 2026.

How we estimate prices and check cars

Price

Fair price: £402 (1%) under the AskCar estimate of £20,201.

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

This 2021 Audi A3 has been on sale for at least 31 days.

Price history

AskCar first saw this advert on 2 October 2026 at £19,949. Its asking price is now £19,799, £150 less. The latest price cut was seen on 29 October 2026.

Price changes recorded:

• 2 October 2026: £19,949
• 6 October 2026: £19,929
• 11 October 2026: £19,899
• 16 October 2026: £19,849
• 21 October 2026: £19,829
• 25 October 2026: £19,819
• 29 October 2026: £19,799

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 2 November 2026: valid until 12 April 2027.

It has had 3 MOTs. The latest, on 9 April 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 18,912 miles, which matches the advertised 21,684 miles.

Advertised mileage is about 21,900 miles lower than the median mileage of a 2021 Audi A3 on AskCar.

Similar cars

49 other 2021 Audi A3 S Line 1.5 petrol automatic hatchbacks are for sale at UK dealers, from £11,990 to £21,995, as of 2 November 2026.

The 3 closest to this car in mileage:

• 2021 Audi A3 S Line, 1.5 petrol hatchback, blue. Mileage: 22,000 miles. Price: £21,995, £2,196 more than this car. Dealer: AM Autohaus in Slough. AskCar page: https://askcar.co.uk/car/audi-a3-2021-58a7db9d6038
• 2021 Audi A3 S Line, 1.5 petrol hatchback, white. Mileage: 22,443 miles. Price: £19,449, £350 less than this car. Dealer: Motorpoint Widnes in Widnes. AskCar page: https://askcar.co.uk/car/audi-a3-2021-9770c3319a01
• 2021 Audi A3 S Line, 1.5 petrol hatchback, grey. Mileage: 22,860 miles. Price: £20,267, £468 more than this car. Dealer: Vindis Group Cambridge Audi in Cambridge. AskCar page: https://askcar.co.uk/car/audi-a3-2021-029c0fd1604c