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: 25,356 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 25,356 miles, approximately 18,300 below the typical mileage for its age. Its asking price of £19,350 is £226 below the AskCar estimate of £19,576. The AskCar estimate draws on 6,763 Audi A3 adverts across the UK, adjusting for age, mileage, trim, engine and other specifications. We first saw this car advertised 1 day ago. Its asking price has since fallen by £2,450. According to the government's MOT record, its advertised mileage is consistent with the latest test. You can find this car 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 14 November 2026.

How we estimate prices and check cars

Price

Fair price: £226 (1%) under the AskCar estimate of £19,576.

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 6,763 priced Audi A3 adverts across different ages and specifications, as of 14 November 2026.

A 2021 Audi A3 with the 1.5 petrol engine is typically advertised at £17,500: the median of the 186 for sale on AskCar, as of 14 November 2026.

Time on sale

AskCar first saw this 2021 Audi A3 advertised 1 day ago. About 6 in 10 of 2021 Audi A3 cars are gone from sale within a month of being advertised: 470 of the 834 first advertised between 14 July 2026 and 11 October 2026.

Price history

AskCar first saw this advert on 13 November 2026 at £21,800. Its asking price is now £19,350, £2,450 less. The latest price cut was seen on 14 November 2026.

Price changes recorded:

• 13 November 2026: £21,800
• 14 November 2026: £19,350

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 14 November 2026: valid until 2 December 2026.

It failed its MOT on 2 December 2025 (nearside front tyre has ply or cords exposed) and passed 1 day later, on 3 December 2025.

There were no advisories at the latest test.

Mileage at that test: 21,801 miles, which matches the advertised 25,356 miles.

Advertised mileage is about 18,300 miles lower than the median mileage of a 2021 Audi A3 on AskCar.

Similar cars

58 other 2021 Audi A3 S Line 1.5 petrol automatic hatchbacks are for sale at UK dealers, from £11,495 to £21,995, as of 14 November 2026.

The 3 closest to this car in mileage:

• 2021 Audi A3 S Line, 1.5 petrol hatchback, grey. Mileage: 24,140 miles. Price: £19,500, £150 more than this car. Dealer: Walters Motor Group - Loddon in Norwich. AskCar page: https://askcar.co.uk/car/audi-a3-2021-9533ba86d6fe
• 2021 Audi A3 S Line, 1.5 petrol hatchback, white. Mileage: 27,272 miles. Price: £17,960, £1,390 less than this car. Dealer: Big Motoring World Blue Bell Hill in Blue Bell Hill. AskCar page: https://askcar.co.uk/car/audi-a3-2021-9265373a4648
• 2021 Audi A3 S Line, 1.5 petrol hatchback, grey. Mileage: 22,860 miles. Price: £20,017, £667 more than this car. Dealer: Vindis Group Cambridge Audi in Cambridge. AskCar page: https://askcar.co.uk/car/audi-a3-2021-029c0fd1604c

• The nearest: 2021 Audi A3 S Line, 1.5 petrol hatchback, white, under a mile from this car. Mileage: 28,922 miles. Price: £18,880, £470 less than this car. Dealer: Big Motoring World Blue Bell Hill in Blue Bell Hill. AskCar page: https://askcar.co.uk/car/audi-a3-2021-510d8a8782d8