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: 18,300 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: Grey
• CO2: 135 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

With 18,300 miles on the clock, this 2021 Audi A3 S Line has done roughly 24,300 fewer miles than a typical 2021 Audi A3. Priced at £20,999, it is advertised £665 above the AskCar estimate of £20,334. The AskCar estimate draws on 6,645 Audi A3 adverts across the UK, adjusting for age, mileage, trim, engine and other specifications. We first recorded this car for sale 2 days ago. Its advertised mileage matches the government's MOT record. The seller is Caffyns Audi Eastbourne, based in Eastbourne. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 5 November 2026.

How we estimate prices and check cars

Price

Fair price: £665 (3%) over the AskCar estimate of £20,334.

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 6,645 priced Audi A3 adverts across different ages and specifications, as of 5 November 2026.

A 2021 Audi A3 with the 1.5 petrol engine is typically advertised at £18,000: the median of the 200 for sale on AskCar, as of 5 November 2026.

Time on sale

AskCar first saw this 2021 Audi A3 advertised 2 days ago. About 6 in 10 of 2021 Audi A3 cars are gone from sale within a month of being advertised: 426 of the 756 first advertised between 7 July 2026 and 2 October 2026.

Price history

AskCar first saw this advert on 3 November 2026 at £20,999. 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 5 November 2026: valid until 26 April 2027.

It has had 3 MOTs. The latest, on 7 April 2026, passed.

Advisories at the latest test: nearside front tyre slightly damaged/cracking or perishing; offside front tyre slightly damaged/cracking or perishing; nearside rear tyre slightly damaged/cracking or perishing; and 1 more.

Mileage at that test: 16,972 miles, which matches the advertised 18,300 miles.

Advertised mileage is about 24,300 miles lower than the median mileage of a 2021 Audi A3 on AskCar.

Similar cars

55 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 5 November 2026.

The 3 closest to this car in mileage:

• 2021 Audi A3 S Line, 1.5 petrol hatchback, grey. Mileage: 18,246 miles. Price: £18,999, £2,000 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: 18,150 miles. Price: £20,300, £699 less 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, blue. Mileage: 16,057 miles. Price: £20,177, £822 less than this car. Dealer: CarSupermarket.com Barnsley in Barnsley. AskCar page: https://askcar.co.uk/car/audi-a3-2021-f1f7270054ea

• The nearest: 2021 Audi A3 S Line, 1.5 petrol hatchback, white, 38 miles from this car. Mileage: 28,922 miles. Price: £19,320, £1,679 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