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: 34,300 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: Blue
• CO2: 135 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 Audi A3 S Line is advertised with 34,300 miles, approximately 9,300 below the typical mileage for its age. The dealer is asking £17,990, which is £1,054 below the AskCar estimate of £19,044. To work out the AskCar estimate, we analyse UK dealer adverts for 6,542 Audi A3 cars across different ages and specifications. It first appeared in our advert records 32 days ago. Its advertised mileage matches the government's MOT record. The seller is BSB Automotive, based in Dartford. 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: £1,054 (5%) under the AskCar estimate of £19,044.

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 32 days.

Price history

AskCar first saw this advert on 1 October 2026 at £17,990. 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 12 April 2027.

It has had 2 MOTs. The latest, on 13 April 2026, passed.

Advisories at the latest test: nearside front inner tyre slightly damaged/cracking or perishing sidewall.

Mileage at that test: 31,534 miles, which matches the advertised 34,300 miles.

Advertised mileage is about 9,300 miles lower 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: 33,794 miles. Price: £18,301, £311 more than this car. Dealer: Carbase Weston-super-Mare in Weston-super-Mare. AskCar page: https://askcar.co.uk/car/audi-a3-2021-b7a2c17f64a6
• 2021 Audi A3 S Line, 1.5 petrol hatchback, white. Mileage: 35,618 miles. Price: £17,500, £490 less than this car. Dealer: A13 Cars in Barking. AskCar page: https://askcar.co.uk/car/audi-a3-2021-45637b81b706
• 2021 Audi A3 S Line, 1.5 petrol hatchback, blue. Mileage: 32,600 miles. Price: £18,995, £1,005 more than this car. Dealer: ZG Prestige in Bolton. AskCar page: https://askcar.co.uk/car/audi-a3-2021-45ad94251488

• The nearest: 2021 Audi A3 S Line, 1.5 petrol hatchback, grey, 7 miles from this car. Mileage: 41,270 miles. Price: £17,507, £483 less than this car. Dealer: Cargem in Rainham. AskCar page: https://askcar.co.uk/car/audi-a3-2021-43f7591315bd