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: 22,000 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 has covered 22,000 miles, around 21,600 fewer miles than is typical for its age. The AskCar estimate for this car is £20,173. It is priced at £21,995, which is £1,822 above that estimate. To work out the AskCar estimate, we analyse UK dealer adverts for 6,542 Audi A3 cars across different ages and specifications. The dealer may accept less. This car has been on sale for at least 77 days. According to the government's MOT record, its advertised mileage is consistent with the latest test. It is advertised by AM Autohaus in Slough. 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

Above the going rate: £1,822 (9%) over the AskCar estimate of £20,173.

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

The dealer may accept less. This 2021 Audi A3 has been on sale for at least 77 days. About 6 in 10 of 2021 Audi A3 cars are gone from sale within a month of being advertised: 403 of the 709 first advertised between 7 July 2026 and 29 September 2026.

Price history

AskCar first saw this advert on 17 August 2026 at £21,995. 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 7 July 2027.

It failed its MOT on 7 July 2026 (rear brake disc in such a condition that it is seriously weakened; front windscreen washer provides insufficient washer liquid) and passed 1 day later, on 8 July 2026.

Advisories at the latest test: nearside front tyre worn close to legal limit/worn on edge.

Mileage at that test: 22,249 miles, which matches the advertised 22,000 miles.

Advertised mileage is about 21,600 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 £20,750, as of 2 November 2026.

The 3 closest to this car in mileage:

• 2021 Audi A3 S Line, 1.5 petrol hatchback, white. Mileage: 21,684 miles. Price: £19,799, £2,196 less than this car. Dealer: Halliwell Jones Premium Trade Cars Southport in Southport. AskCar page: https://askcar.co.uk/car/audi-a3-2021-296d3558ff7f
• 2021 Audi A3 S Line, 1.5 petrol hatchback, white. Mileage: 22,443 miles. Price: £19,449, £2,546 less than this car. Dealer: Motorpoint Widnes in Widnes. AskCar page: https://askcar.co.uk/car/audi-a3-2021-9770c3319a01
• 2021 Audi A3 S Line, 1.5 petrol hatchback, grey. Mileage: 22,860 miles. Price: £20,267, £1,728 less than this car. Dealer: Vindis Group Cambridge Audi in Cambridge. AskCar page: https://askcar.co.uk/car/audi-a3-2021-029c0fd1604c

• The nearest: 2021 Audi A3 S Line, 1.5 petrol hatchback, grey, 13 miles from this car. Mileage: 45,860 miles. Price: £17,995, £4,000 less than this car. Dealer: ARJ Motors in Addlestone. AskCar page: https://askcar.co.uk/car/audi-a3-2021-39034688bbc9