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: 16,057 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: Blue
• CO2: 135 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 Audi A3 S Line is advertised with 16,057 miles, approximately 27,200 below the typical mileage for its age. The dealer is asking £20,177, which is £387 below the AskCar estimate of £20,564. To work out the AskCar estimate, we analyse UK dealer adverts for 6,630 Audi A3 cars across different ages and specifications. We first saw this car advertised 18 days ago. Its asking price has since fallen by £300. According to the government's MOT record, its advertised mileage is consistent with the latest test. The seller is CarSupermarket.com Barnsley, based in Barnsley. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 4 November 2026.

How we estimate prices and check cars

Price

Fair price: £387 (1%) under the AskCar estimate of £20,564.

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 6,630 priced Audi A3 adverts across different ages and specifications, as of 4 November 2026.

A 2021 Audi A3 with the 1.5 petrol engine is typically advertised at £18,000: the median of the 194 for sale on AskCar, as of 4 November 2026.

Time on sale

This 2021 Audi A3 has been on sale for at least 18 days.

Price history

AskCar first saw this advert on 17 October 2026 at £20,477. Its asking price is now £20,177, £300 less. The latest price cut was seen on 31 October 2026.

Price changes recorded:

• 17 October 2026: £20,477
• 31 October 2026: £20,177

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 4 November 2026: valid until 24 October 2027.

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

There were no advisories at the latest test.

Mileage at that test: 15,966 miles, which matches the advertised 16,057 miles.

Advertised mileage is about 27,200 miles lower than the median mileage of a 2021 Audi A3 on AskCar.

Similar cars

54 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 4 November 2026.

The 3 closest to this car in mileage:

• 2021 Audi A3 S Line, 1.5 petrol hatchback, grey. Mileage: 18,150 miles. Price: £20,300, £123 more than this car. Dealer: ZG Prestige in Bolton. AskCar page: https://askcar.co.uk/car/audi-a3-2021-42afac1d3832
• 2021 Audi A3 S Line, 1.5 petrol hatchback, grey. Mileage: 18,246 miles. Price: £18,999, £1,178 less than this car. Dealer: Days Motorpark in Swansea. AskCar page: https://askcar.co.uk/car/audi-a3-2021-d4b7e7eb277e
• 2021 Audi A3 S Line, 1.5 petrol hatchback, grey. Mileage: 18,300 miles. Price: £20,999, £822 more than this car. Dealer: Caffyns Audi Eastbourne in Eastbourne. AskCar page: https://askcar.co.uk/car/audi-a3-2021-625739117567

• The nearest: 2021 Audi A3 S Line, 1.5 petrol hatchback, grey, 17 miles from this car. Mileage: 71,439 miles. Price: £15,680, £4,497 less than this car. Dealer: Big Motoring World Leeds in Leeds. AskCar page: https://askcar.co.uk/car/audi-a3-2021-8ee864ddeba4