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: 44,495 miles
• Fuel: Diesel
• Body: Hatchback, 5 doors, 5 seats
• Engine: 2.0 litres, 148 bhp
• Gearbox: Automatic (S tronic)
• Drive: Front-wheel drive
• Colour: Black
• CO2: 127 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 Audi A3 S Line is advertised with 44,495 miles on the clock. Its asking price of £17,490 is £1,220 below the AskCar estimate of £18,710. The AskCar estimate uses 6,542 UK dealer adverts for the Audi A3, with adjustments for age, mileage, trim, engine and other specifications. We first recorded this advert 113 days ago, and its asking price has since fallen by £910. The recorded MOT expired on 3 June 2026, so ask the dealer whether it has been renewed. According to the government's MOT record, its advertised mileage is consistent with the latest test. The seller is Barlow Motors Crewe Skoda, based in Crewe. 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: £1,220 (6%) under the AskCar estimate of £18,710.

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 2.0 diesel engine is typically advertised at £17,400: the median of the 45 for sale on AskCar, as of 2 November 2026.

Time on sale

This 2021 Audi A3 has been on sale for at least 113 days.

Price history

AskCar first saw this advert on 12 July 2026 at £18,400. Its asking price is now £17,490, £910 less. The latest price cut was seen on 25 October 2026.

Price changes recorded:

• 12 July 2026: £18,400
• 8 August 2026: £18,300
• 17 August 2026: £18,200
• 16 September 2026: £17,990
• 25 October 2026: £17,490

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 2 November 2026: the latest record we hold ran out on 3 June 2026; ask the dealer for the current MOT.

It failed its MOT on 2 June 2025 (offside rear tyre tread depth below requirements of 1.6mm) and passed later the same day.

There were no advisories at the latest test.

Mileage at that test: 35,307 miles, which matches the advertised 44,495 miles.

Advertised mileage is about 900 miles higher than the median mileage of a 2021 Audi A3 on AskCar.

Similar cars

6 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 2 November 2026.

The 3 closest to this car in mileage:

• 2021 Audi A3 S Line, 2.0 diesel hatchback, white. Mileage: 43,744 miles. Price: £18,000, £510 more than this car. Dealer: Sytner Group West London Audi in London. AskCar page: https://askcar.co.uk/car/audi-a3-2021-faa149fc5438
• 2021 Audi A3 S Line, 2.0 diesel hatchback, white. Mileage: 45,833 miles. Price: £17,400, £90 less than this car. Dealer: Essex Car Company in Rainham. AskCar page: https://askcar.co.uk/car/audi-a3-2021-05a9f027fafc
• 2021 Audi A3 S Line, 2.0 diesel hatchback, white. Mileage: 42,232 miles. Price: £18,520, £1,030 more than this car. Dealer: Vertu Audi Hereford in Hereford. AskCar page: https://askcar.co.uk/car/audi-a3-2021-5625e61092eb

• The nearest: 2021 Audi A3 S Line, 2.0 diesel hatchback, black, 10 miles from this car. Mileage: 25,000 miles. Price: £18,500, £1,010 more than this car. Dealer: George Rhodes And Sons in Biddulph. AskCar page: https://askcar.co.uk/car/audi-a3-2021-b78dcff2cbf2