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: 35,618 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: White
• CO2: 135 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 Audi A3 S Line is advertised with 35,618 miles, approximately 7,600 below the typical mileage for its age. The AskCar estimate for this car is £18,803. It is priced at £17,500, which is £1,303 below that estimate. The AskCar estimate draws on 6,630 Audi A3 adverts across the UK, adjusting for age, mileage, trim, engine and other specifications. We first saw this car advertised 34 days ago. Its asking price has since fallen by £654. The government's MOT record matches its advertised mileage. It is advertised by A13 Cars in Barking. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 4 November 2026.

How we estimate prices and check cars

Price

Fair price: £1,303 (6%) under the AskCar estimate of £18,803.

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 6,630 priced Audi A3 adverts across different ages and specifications, as of 4 November 2026.

A 2021 Audi A3 with the 1.5 petrol engine is typically advertised at £18,000: the median of the 194 for sale on AskCar, as of 4 November 2026.

Time on sale

This 2021 Audi A3 has been on sale for at least 34 days.

Price history

AskCar first saw this advert on 1 October 2026 at £18,154. Its asking price is now £17,500, £654 less. The latest price cut was seen on 22 October 2026.

Price changes recorded:

• 1 October 2026: £18,154
• 13 October 2026: £18,000
• 17 October 2026: £17,795
• 22 October 2026: £17,500

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 4 November 2026: valid until 25 March 2027.

It has had 3 MOTs. The latest, on 24 March 2026, passed.

Advisories at the latest test: nearside front outer tyre slightly damaged sidewall; windscreen damaged but not adversely affecting driver's view small chip.

Mileage at that test: 31,838 miles, which matches the advertised 35,618 miles.

Advertised mileage is about 7,600 miles lower than the median mileage of a 2021 Audi A3 on AskCar.

Similar cars

54 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 4 November 2026.

The 3 closest to this car in mileage:

• 2021 Audi A3 S Line, 1.5 petrol hatchback, white. Mileage: 36,118 miles. Price: £18,499, £999 more than this car. Dealer: Motorpoint Derby in Derby. AskCar page: https://askcar.co.uk/car/audi-a3-2021-255bdf7c947d
• 2021 Audi A3 S Line, 1.5 petrol hatchback, white. Mileage: 36,385 miles. Price: £18,030, £530 more than this car. Dealer: Big Motoring World Camberley in Camberley. AskCar page: https://askcar.co.uk/car/audi-a3-2021-34419e266718
• 2021 Audi A3 S Line, 1.5 petrol hatchback, grey. Mileage: 36,386 miles. Price: £18,199, £699 more than this car. Dealer: Eastern Western Motor Group Car Deal Warehouse Glasgow in Glasgow. AskCar page: https://askcar.co.uk/car/audi-a3-2021-02d0627ca7cb

• The nearest: 2021 Audi A3 S Line, 1.5 petrol hatchback, grey, 4 miles from this car. Mileage: 41,270 miles. Price: £17,407, £93 less than this car. Dealer: Cargem in Rainham. AskCar page: https://askcar.co.uk/car/audi-a3-2021-43f7591315bd