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: 36,644 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: Black
• CO2: 131 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

At 36,644 miles, this 2021 Audi A3 S Line has covered about 7,000 fewer miles than other 2021 Audi A3 cars. Priced at £18,180, it is advertised £692 below the AskCar estimate of £18,872. To work out the AskCar estimate, we analyse UK dealer adverts for 6,542 Audi A3 cars across different ages and specifications. We first saw this car advertised 10 days ago. Its asking price has since fallen by £10. According to the government's MOT record, its advertised mileage is consistent with the latest test. The seller is Evans Halshaw BYD Milton Keynes, based in Milton Keynes. 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: £692 (3%) under the AskCar estimate of £18,872.

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 10 days.

Price history

AskCar first saw this advert on 23 October 2026 at £18,190. Its asking price is now £18,180, £10 less. The latest price cut was seen on 27 October 2026.

Price changes recorded:

• 23 October 2026: £18,190
• 27 October 2026: £18,180

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 2 November 2026: valid until 30 April 2027.

It has had 3 MOTs. The latest, on 27 April 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 36,068 miles, which matches the advertised 36,644 miles.

Advertised mileage is about 7,000 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: 39,000 miles. Price: £20,995, £2,815 more than this car. Dealer: Prestigio Motor Company in Watford. AskCar page: https://askcar.co.uk/car/audi-a3-2021-1a321b81a2e4
• 2021 Audi A3 S Line, 1.5 petrol saloon, grey. Mileage: 33,869 miles. Price: £18,995, £815 more than this car. Dealer: Banchory Car Centre in Banchory. AskCar page: https://askcar.co.uk/car/audi-a3-2021-57778ec890a1
• 2021 Audi A3 S Line, 1.5 petrol saloon, blue. Mileage: 39,502 miles. Price: £18,049, £131 less than this car. Dealer: Motorpoint Newport in Newport. AskCar page: https://askcar.co.uk/car/audi-a3-2021-c9ea56239f41

• The nearest: 2021 Audi A3 S Line, 1.5 petrol saloon, black, 5 miles from this car. Mileage: 51,176 miles. Price: £17,495, £685 less than this car. Dealer: NSA Motor Vehicles in Milton Keynes. AskCar page: https://askcar.co.uk/car/audi-a3-2021-b5efd633c8fb