2021 Audi A3 2.0 TDI S Line

Overview

• Make: Audi
• Model: A3
• Trim: S Line
• Version: 2.0 TDI 35 S Line S tronic FWD Euro 6 (s/s) 5dr Sportback (148 bhp)
• Year: 2021
• Mileage: 43,744 miles
• Fuel: Diesel
• Body: Hatchback, 5 doors, 5 seats
• Engine: 2.0 litres, 148 bhp
• Gearbox: Automatic (S tronic)
• Drive: Front-wheel drive
• Colour: White
• CO2: 127 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

The advertised mileage for this 2021 Audi A3 S Line is 43,744 miles. Priced at £18,000, it is advertised £982 below the AskCar estimate of £18,982. To work out the AskCar estimate, we analyse UK dealer adverts for 6,645 Audi A3 cars across different ages and specifications. We first recorded this advert 54 days ago, and its asking price has since fallen by £1,500. According to the government's MOT record, its advertised mileage is consistent with the latest test. It is for sale at Sytner Group West London Audi in Brentford. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 5 November 2026.

How we estimate prices and check cars

Price

Fair price: £982 (5%) under the AskCar estimate of £18,982.

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 6,645 priced Audi A3 adverts across different ages and specifications, as of 5 November 2026.

A 2021 Audi A3 with the 2.0 diesel engine is typically advertised at £18,000: the median of the 47 for sale on AskCar, as of 5 November 2026.

Time on sale

This 2021 Audi A3 has been on sale for at least 54 days.

Price history

AskCar first saw this advert on 12 September 2026 at £19,500. Its asking price is now £18,000, £1,500 less. The latest price cut was seen on 29 October 2026.

Price changes recorded:

• 12 September 2026: £19,500
• 13 October 2026: £18,750
• 17 October 2026: £18,500
• 29 October 2026: £18,000

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 5 November 2026: valid until 14 May 2027.

It has had 3 MOTs. The latest, on 11 May 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 40,774 miles, which matches the advertised 43,744 miles.

Advertised mileage is about 1,100 miles higher than the median mileage of a 2021 Audi A3 on AskCar.

Similar cars

5 other 2021 Audi A3 S Line 2.0 diesel automatic hatchbacks are for sale at UK dealers, from £15,950 to £18,520, as of 5 November 2026.

The 3 closest to this car in mileage:

• 2021 Audi A3 S Line, 2.0 diesel hatchback, black. Mileage: 44,495 miles. Price: £17,490, £510 less than this car. Dealer: Barlow Motors Crewe Skoda in Crewe. AskCar page: https://askcar.co.uk/car/audi-a3-2021-ea0fc4041912
• 2021 Audi A3 S Line, 2.0 diesel hatchback, white. Mileage: 42,232 miles. Price: £18,520, £520 more than this car. Dealer: Vertu Audi Hereford in Hereford. AskCar page: https://askcar.co.uk/car/audi-a3-2021-5625e61092eb
• 2021 Audi A3 S Line, 2.0 diesel hatchback, white. Mileage: 45,833 miles. Price: £17,400, £600 less than this car. Dealer: Essex Car Company in Rainham. AskCar page: https://askcar.co.uk/car/audi-a3-2021-05a9f027fafc