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: 41,920 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: Black
• CO2: 135 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

The advertised mileage for this 2021 Audi A3 S Line is 41,920 miles. Its asking price of £17,698 is £482 below the AskCar estimate of £18,180. The AskCar estimate uses 6,630 UK dealer adverts for the Audi A3, with adjustments for age, mileage, trim, engine and other specifications. We first recorded this car for sale 1 day ago. The government's MOT record matches its advertised mileage. You can find this car at BTS Cars in Derby. 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: £482 (2%) under the AskCar estimate of £18,180.

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

AskCar first saw this 2021 Audi A3 advertised 1 day ago. About 6 in 10 of 2021 Audi A3 cars are gone from sale within a month of being advertised: 419 of the 741 first advertised between 7 July 2026 and 1 October 2026.

Price history

AskCar first saw this advert on 3 November 2026 at £17,698. 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 4 November 2026: valid until 16 February 2027.

It has had 3 MOTs. The latest, on 17 February 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 38,670 miles, which matches the advertised 41,920 miles.

Advertised mileage is about 1,300 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: 42,342 miles. Price: £19,750, £2,052 more than this car. Dealer: Sytner Group Nottingham Audi in Nottingham. AskCar page: https://askcar.co.uk/car/audi-a3-2021-53d1a219332d
• 2021 Audi A3 S Line, 1.5 petrol hatchback, blue. Mileage: 42,379 miles. Price: £17,699, the same price as this car. Dealer: Hartwell Kidlington in Kidlington. AskCar page: https://askcar.co.uk/car/audi-a3-2021-a2adc0ca3b6b
• 2021 Audi A3 S Line, 1.5 petrol hatchback, grey. Mileage: 41,270 miles. Price: £17,407, £291 less than this car. Dealer: Cargem in Rainham. AskCar page: https://askcar.co.uk/car/audi-a3-2021-43f7591315bd

• The nearest: 2021 Audi A3 S Line, 1.5 petrol hatchback, white, 2 miles from this car. Mileage: 36,118 miles. Price: £18,499, £801 more than this car. Dealer: Motorpoint Derby in Derby. AskCar page: https://askcar.co.uk/car/audi-a3-2021-255bdf7c947d