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) 4dr (148 bhp)
• Year: 2021
• Mileage: 63,113 miles
• Fuel: Diesel
• Body: Saloon, 4 doors, 5 seats
• Engine: 2.0 litres, 148 bhp
• Gearbox: Automatic (S tronic)
• Drive: Front-wheel drive
• Colour: Grey
• CO2: 124 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 Audi A3 S Line has covered 63,113 miles. The AskCar estimate for this car is £16,426. It is priced at £15,650, which is £776 below that estimate. The AskCar estimate uses 6,691 UK dealer adverts for the Audi A3, with adjustments for age, mileage, trim, engine and other specifications. Since we first spotted the advert 163 days ago, the asking price has dropped by £1,625. Ask the dealer why the advert shows fewer miles than the 65,349 recorded at the latest MOT. MOT records show an expiry date of 18 May 2027. You can find this car at Stoneacre in Peterborough. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 7 November 2026.

How we estimate prices and check cars

Price

Fair price: £776 (4%) under the AskCar estimate of £16,426.

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 6,691 priced Audi A3 adverts across different ages and specifications, as of 7 November 2026.

A 2021 Audi A3 with the 2.0 diesel engine is typically advertised at £17,500: the median of the 45 for sale on AskCar, as of 7 November 2026.

Time on sale

This 2021 Audi A3 has been on sale for at least 163 days.

Price history

AskCar first saw this advert on 28 May 2026 at £17,275. Its asking price is now £15,650, £1,625 less. The latest price cut was seen on 19 October 2026.

Price changes recorded:

• 28 May 2026: £17,275
• 6 June 2026: £16,999
• 17 June 2026: £16,799
• 1 July 2026: £16,717
• 9 July 2026: £16,599
• 22 July 2026: £16,299
• 30 July 2026: £15,999
• 2 September 2026: £15,717
• 21 September 2026: £15,903
• 4 October 2026: £15,500
• 5 October 2026: £15,825
• 19 October 2026: £15,650

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 7 November 2026: valid until 18 May 2027.

It has had 3 MOTs. The latest, on 19 May 2026, passed.

Advisories at the latest test: nearside front lower windscreen damaged but not adversely affecting driver's view stone chipped; nearside front tyre wearing unevenly outside edges; offside rear tyre slightly damaged/cracking or perishing outside edges; and 2 more.

Mileage at that test: 65,349 miles. The advert says 63,113 miles, fewer than the MOT record, so ask the dealer which is right.

Advertised mileage is about 20,800 miles higher than the median mileage of a 2021 Audi A3 on AskCar.

Similar cars

3 other 2021 Audi A3 S Line 2.0 diesel automatic saloons are for sale at UK dealers, from £15,795 to £18,795, as of 7 November 2026.

The 3 closest to this car in mileage:

• 2021 Audi A3 S Line, 2.0 diesel saloon, grey. Mileage: 71,923 miles. Price: £15,795, £145 more than this car. Dealer: S & R Motors in Swindon. AskCar page: https://askcar.co.uk/car/audi-a3-2021-e7ef4cf5aa43
• 2021 Audi A3 S Line, 2.0 diesel saloon, white. Mileage: 40,682 miles. Price: £18,795, £3,145 more than this car. Dealer: Group 1 Automotive Southend Audi in Thundersley and South Benfleet. AskCar page: https://askcar.co.uk/car/audi-a3-2021-9f7dbaa9cf1d
• 2021 Audi A3 S Line, 2.0 diesel saloon, black. Mileage: 36,250 miles. Price: £17,450, £1,800 more than this car. Dealer: Group 1 Automotive Watford Audi in Watford. AskCar page: https://askcar.co.uk/car/audi-a3-2021-c91e9540ac3c