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: 51,550 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 51,550 miles, around 8,000 more miles than is typical for its age. Priced at £17,300, it is advertised £59 below the AskCar estimate of £17,359. The AskCar estimate uses UK dealer asking prices, including 6,542 Audi A3 adverts, and accounts for the car’s age, mileage and specification. Since we first spotted the advert 25 days ago, the asking price has dropped by £195. The government's MOT record matches its advertised mileage. 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 2 November 2026.

How we estimate prices and check cars

Price

Fair price: £59 (under 1%) under the AskCar estimate of £17,359.

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 25 days.

Price history

AskCar first saw this advert on 8 October 2026 at £17,495. Its asking price is now £17,300, £195 less. The latest price cut was seen on 22 October 2026.

Price changes recorded:

• 8 October 2026: £17,495
• 22 October 2026: £17,300

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 2 November 2026: valid until 13 August 2027.

It failed its MOT on 7 August 2026 (nearside front outer tyre has a cut in excess of the requirements deep enough to reach the ply or cords; offside rear shock absorbers has a serious fluid leak) and passed 5 days later, on 12 August 2026.

There were no advisories at the latest test.

Mileage at that test: 49,778 miles, which matches the advertised 51,550 miles.

Advertised mileage is about 8,000 miles higher than the median mileage of a 2021 Audi A3 on AskCar.

Similar cars

49 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 2 November 2026.

The 3 closest to this car in mileage:

• 2021 Audi A3 S Line, 1.5 petrol hatchback, white. Mileage: 51,730 miles. Price: £17,995, £695 more than this car. Dealer: Hawco Group in Dundee. AskCar page: https://askcar.co.uk/car/audi-a3-2021-2566e8d139dd
• 2021 Audi A3 S Line, 1.5 petrol hatchback, grey. Mileage: 52,428 miles. Price: £17,495, £195 more than this car. Dealer: Shakespeare Street Garage in Lincoln. AskCar page: https://askcar.co.uk/car/audi-a3-2021-019e381a240d
• 2021 Audi A3 S Line, 1.5 petrol hatchback, white. Mileage: 50,500 miles. Price: £16,790, £510 less than this car. Dealer: K Motors London in New Malden. AskCar page: https://askcar.co.uk/car/audi-a3-2021-955301d556ce

• The nearest: 2021 Audi A3 S Line, 1.5 petrol hatchback, grey, under a mile from this car. Mileage: 18,150 miles. Price: £20,300, £3,000 more than this car. Dealer: ZG Prestige in Bolton. AskCar page: https://askcar.co.uk/car/audi-a3-2021-42afac1d3832