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) 5dr Sportback (148 bhp)
• Year: 2021
• Mileage: 18,150 miles
• Fuel: Petrol, mild hybrid
• Body: Hatchback, 5 doors, 5 seats
• Engine: 1.5 litres, 148 bhp
• Gearbox: Automatic (S tronic)
• Drive: Front-wheel drive
• Colour: Grey
• CO2: 135 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 Audi A3 S Line has covered 18,150 miles, around 25,100 fewer miles than is typical for its age. Its asking price of £20,300 is £81 below the AskCar estimate of £20,381. The AskCar estimate uses UK dealer asking prices, including 6,630 Audi A3 adverts, and accounts for the car’s age, mileage and specification. We first saw this car advertised 28 days ago. Its asking price has since fallen by £195. We checked its advertised mileage against the government's MOT record, and they match. It is advertised by ZG Prestige in Bolton. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 4 November 2026.

How we estimate prices and check cars

Price

Fair price: £81 (under 1%) under the AskCar estimate of £20,381.

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 6,630 priced Audi A3 adverts across different ages and specifications, as of 4 November 2026.

A 2021 Audi A3 with the 1.5 petrol engine is typically advertised at £18,000: the median of the 194 for sale on AskCar, as of 4 November 2026.

Time on sale

This 2021 Audi A3 has been on sale for at least 28 days.

Price history

AskCar first saw this advert on 7 October 2026 at £20,495. Its asking price is now £20,300, £195 less. The latest price cut was seen on 31 October 2026.

Price changes recorded:

• 7 October 2026: £20,495
• 31 October 2026: £20,300

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 4 November 2026: valid until 2 September 2027.

It has had 3 MOTs. The latest, on 12 August 2026, passed.

Advisories at the latest test: nearside front inner tyre worn close to legal limit/worn on edge edge and cracking; offside front inner tyre worn close to legal limit/worn on edge edge and cracking; nearside rear outer tyre slightly damaged/cracking or perishing edge; and 1 more.

Mileage at that test: 17,749 miles, which matches the advertised 18,150 miles.

Advertised mileage is about 25,100 miles lower than the median mileage of a 2021 Audi A3 on AskCar.

Similar cars

54 other 2021 Audi A3 S Line 1.5 petrol automatic hatchbacks are for sale at UK dealers, from £11,990 to £21,995, as of 4 November 2026.

The 3 closest to this car in mileage:

• 2021 Audi A3 S Line, 1.5 petrol hatchback, grey. Mileage: 18,246 miles. Price: £18,999, £1,301 less than this car. Dealer: Days Motorpark in Swansea. AskCar page: https://askcar.co.uk/car/audi-a3-2021-d4b7e7eb277e
• 2021 Audi A3 S Line, 1.5 petrol hatchback, grey. Mileage: 18,300 miles. Price: £20,999, £699 more than this car. Dealer: Caffyns Audi Eastbourne in Eastbourne. AskCar page: https://askcar.co.uk/car/audi-a3-2021-625739117567
• 2021 Audi A3 S Line, 1.5 petrol hatchback, blue. Mileage: 16,057 miles. Price: £20,177, £123 less than this car. Dealer: CarSupermarket.com Barnsley in Barnsley. AskCar page: https://askcar.co.uk/car/audi-a3-2021-f1f7270054ea

• The nearest: 2021 Audi A3 S Line, 1.5 petrol hatchback, blue, under a mile from this car. Mileage: 32,600 miles. Price: £18,800, £1,500 less than this car. Dealer: ZG Prestige in Bolton. AskCar page: https://askcar.co.uk/car/audi-a3-2021-45ad94251488