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: 27,791 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: Grey
• CO2: 131 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 Audi A3 S Line is advertised with 27,791 miles, approximately 15,800 below the typical mileage for its age. Its asking price of £18,999 is £745 below the AskCar estimate of £19,744. The AskCar estimate uses 6,542 UK dealer adverts for the Audi A3, with adjustments for age, mileage, trim, engine and other specifications. This car was first seen in our listings data 31 days ago. Its advertised mileage matches the government's MOT record. The seller is HPL Preston, based in Preston. 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: £745 (3%) under the AskCar estimate of £19,744.

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

This 2021 Audi A3 has been on sale for at least 31 days.

Price history

AskCar first saw this advert on 2 October 2026 at £18,999. 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 21 March 2027.

It has had 3 MOTs. The latest, on 23 February 2026, passed.

Advisories at the latest test: nearside front windscreen damaged but not adversely affecting driver's view small crack in swept area.

Mileage at that test: 25,585 miles, which matches the advertised 27,791 miles.

Advertised mileage is about 15,800 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, grey. Mileage: 29,030 miles. Price: £18,895, £104 less than this car. Dealer: V12 Sports & Classics Ltd - Hinckley in Hinckley. AskCar page: https://askcar.co.uk/car/audi-a3-2021-8dfede7c20ea
• 2021 Audi A3 S Line, 1.5 petrol saloon, grey. Mileage: 30,115 miles. Price: £18,337, £662 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, black. Mileage: 31,587 miles. Price: £20,950, £1,951 more than this car. Dealer: Group 1 Automotive Chingford Audi in Chingford. AskCar page: https://askcar.co.uk/car/audi-a3-2021-6c4c89e0748f

• The nearest: 2021 Audi A3 S Line, 1.5 petrol saloon, white, 27 miles from this car. Mileage: 59,853 miles. Price: £16,400, £2,599 less than this car. Dealer: Invicta Chery Warrington in Warrington. AskCar page: https://askcar.co.uk/car/audi-a3-2021-9f95418af774