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) 4dr (148 bhp)
• Year: 2021
• Mileage: 32,077 miles
• Fuel: Petrol, mild hybrid
• Body: Saloon, 4 doors, 5 seats
• Engine: 1.5 litres, 148 bhp
• Gearbox: Automatic (S tronic)
• Drive: Front-wheel drive
• Colour: White
• CO2: 131 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 Audi A3 S Line is advertised with 32,077 miles, approximately 11,500 below the typical mileage for its age. The AskCar estimate for this car is £19,340. It is priced at £18,795, which is £545 below that estimate. The AskCar estimate draws on 6,542 Audi A3 adverts across the UK, adjusting for age, mileage, trim, engine and other specifications. It first appeared in our advert records 13 days ago. We checked its advertised mileage against the government's MOT record, and they match. The seller is Car Brothers NI, based in Newtownabbey. 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: £545 (2%) under the AskCar estimate of £19,340.

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 13 days.

Price history

AskCar first saw this advert on 20 October 2026 at £18,795. 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 2 November 2026: valid until 24 April 2027.

It has had 2 MOTs. The latest, on 25 April 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 26,118 miles, which matches the advertised 32,077 miles.

Advertised mileage is about 11,500 miles lower than the median mileage of a 2021 Audi A3 on AskCar.

Similar cars

31 other 2021 Audi A3 S Line 1.5 petrol automatic saloons are for sale at UK dealers, from £11,995 to £20,995, as of 2 November 2026.

The 3 closest to this car in mileage:

• 2021 Audi A3 S Line, 1.5 petrol saloon, black. Mileage: 31,587 miles. Price: £20,950, £2,155 more than this car. Dealer: Group 1 Automotive Chingford Audi in Chingford. AskCar page: https://askcar.co.uk/car/audi-a3-2021-6c4c89e0748f
• 2021 Audi A3 S Line, 1.5 petrol saloon, white. Mileage: 33,764 miles. Price: £19,199, £404 more than this car. Dealer: Cinch Ev Superstore Derby in Derby. AskCar page: https://askcar.co.uk/car/audi-a3-2021-67eb248d1a7c
• 2021 Audi A3 S Line, 1.5 petrol saloon, grey. Mileage: 33,869 miles. Price: £18,995, £200 more than this car. Dealer: Banchory Car Centre in Banchory. AskCar page: https://askcar.co.uk/car/audi-a3-2021-57778ec890a1

• The nearest: 2021 Audi A3 S Line, 1.5 petrol saloon, grey, 148 miles from this car. Mileage: 27,791 miles. Price: £18,999, £204 more than this car. Dealer: HPL Preston in Preston. AskCar page: https://askcar.co.uk/car/audi-a3-2021-bf90a185cea2