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: 44,578 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

The advertised mileage for this 2021 Audi A3 S Line is 44,578 miles. Its asking price of £17,660 is £361 below the AskCar estimate of £18,021. The AskCar estimate draws on 6,542 Audi A3 adverts across the UK, adjusting for age, mileage, trim, engine and other specifications. We first saw this car advertised 29 days ago. Its asking price has since fallen by £450. We checked its advertised mileage against the government's MOT record, and they match. 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 2 November 2026.

How we estimate prices and check cars

Price

Fair price: £361 (2%) under the AskCar estimate of £18,021.

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 29 days.

Price history

AskCar first saw this advert on 4 October 2026 at £18,110. Its asking price is now £17,660, £450 less. The latest price cut was seen on 28 October 2026.

Price changes recorded:

• 4 October 2026: £18,110
• 6 October 2026: £18,100
• 8 October 2026: £18,070
• 10 October 2026: £18,050
• 13 October 2026: £18,020
• 16 October 2026: £18,010
• 19 October 2026: £17,970
• 21 October 2026: £17,880
• 27 October 2026: £17,840
• 28 October 2026: £17,660

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 2 November 2026: valid until 21 September 2027.

It has had 4 MOTs. The latest, on 18 September 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 44,357 miles, which matches the advertised 44,578 miles.

Advertised mileage is about 1,000 miles higher 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, black. Mileage: 44,821 miles. Price: £17,699, the same price as this car. Dealer: Carherts in Aylesbury. AskCar page: https://askcar.co.uk/car/audi-a3-2021-6de78dd713d8
• 2021 Audi A3 S Line, 1.5 petrol hatchback, grey. Mileage: 45,860 miles. Price: £17,995, £335 more than this car. Dealer: ARJ Motors in Addlestone. AskCar page: https://askcar.co.uk/car/audi-a3-2021-39034688bbc9
• 2021 Audi A3 S Line, 1.5 petrol hatchback, red. Mileage: 46,087 miles. Price: £17,066, £594 less than this car. Dealer: Carsa Cannock in Cannock. AskCar page: https://askcar.co.uk/car/audi-a3-2021-5c2ab42d2bcf

• The nearest: 2021 Audi A3 S Line, 1.5 petrol hatchback, white, under a mile from this car. Mileage: 28,922 miles. Price: £19,380, £1,720 more 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