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: 31,587 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

This 2021 Audi A3 S Line is advertised with 31,587 miles, approximately 12,000 below the typical mileage for its age. Priced at £20,950, it is advertised £1,559 above the AskCar estimate of £19,391. 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 car for sale today. According to the government's MOT record, its advertised mileage is consistent with the latest test. The seller is Group 1 Automotive Chingford Audi, based in Chingford. 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

Above the going rate: £1,559 (8%) over the AskCar estimate of £19,391.

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

AskCar first saw this 2021 Audi A3 advertised today. About 6 in 10 of 2021 Audi A3 cars are gone from sale within a month of being advertised: 403 of the 709 first advertised between 7 July 2026 and 29 September 2026.

Price history

AskCar first saw this advert on 2 November 2026 at £20,950. Its asking price has not changed.

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 2 November 2026: valid until 23 October 2027.

It has had 4 MOTs. The latest, on 7 October 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 31,094 miles, which matches the advertised 31,587 miles.

Advertised mileage is about 12,000 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, white. Mileage: 32,077 miles. Price: £18,795, £2,155 less than this car. Dealer: Car Brothers NI in Newtownabbey. AskCar page: https://askcar.co.uk/car/audi-a3-2021-21b9c79555a3
• 2021 Audi A3 S Line, 1.5 petrol saloon, grey. Mileage: 30,115 miles. Price: £18,337, £2,613 less than this car. Dealer: JCT600 Volkswagen Sheffield in Sheffield. AskCar page: https://askcar.co.uk/car/audi-a3-2021-9772e08d59f4
• 2021 Audi A3 S Line, 1.5 petrol saloon, white. Mileage: 33,764 miles. Price: £19,199, £1,751 less than this car. Dealer: Cinch Ev Superstore Derby in Derby. AskCar page: https://askcar.co.uk/car/audi-a3-2021-67eb248d1a7c

• The nearest: 2021 Audi A3 S Line, 1.5 petrol saloon, grey, 9 miles from this car. Mileage: 79,653 miles. Price: £15,495, £5,455 less than this car. Dealer: Motor Link London in London. AskCar page: https://askcar.co.uk/car/audi-a3-2021-de221815c838