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: 29,145 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

At 29,145 miles, this 2021 Audi A3 S Line has covered about 14,500 fewer miles than other 2021 Audi A3 cars. The AskCar estimate for this car is £19,560. It is priced at £19,578, which is £18 above that estimate. The AskCar estimate draws on 6,542 Audi A3 adverts across the UK, adjusting for age, mileage, trim, engine and other specifications. We first recorded this advert 33 days ago, and its asking price has since fallen by £386. Its advertised mileage matches the government's MOT record. The seller is Lookers Audi Guildford, based in Guildford. 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: £18 (under 1%) over the AskCar estimate of £19,560.

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 33 days.

Price history

AskCar first saw this advert on 30 September 2026 at £19,964. Its asking price is now £19,578, £386 less. The latest price cut was seen on 31 October 2026.

Price changes recorded:

• 30 September 2026: £19,964
• 15 October 2026: £19,858
• 21 October 2026: £19,707
• 31 October 2026: £19,578

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 2 November 2026: valid until 29 May 2027.

It has had 4 MOTs. The latest, on 11 May 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 27,402 miles, which matches the advertised 29,145 miles.

Advertised mileage is about 14,500 miles lower 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: 28,922 miles. Price: £19,380, £198 less than this car. Dealer: Big Motoring World Blue Bell Hill in Blue Bell Hill. AskCar page: https://askcar.co.uk/car/audi-a3-2021-510d8a8782d8
• 2021 Audi A3 S Line, 1.5 petrol hatchback, red. Mileage: 28,344 miles. Price: £19,649, £71 more than this car. Dealer: Lookers Audi Tyneside in Tynemouth. AskCar page: https://askcar.co.uk/car/audi-a3-2021-ce1fdd996dd2
• 2021 Audi A3 S Line, 1.5 petrol hatchback, white. Mileage: 27,272 miles. Price: £19,200, £378 less than this car. Dealer: Big Motoring World Blue Bell Hill in Blue Bell Hill. AskCar page: https://askcar.co.uk/car/audi-a3-2021-9265373a4648

• The nearest: 2021 Audi A3 S Line, 1.5 petrol hatchback, grey, 8 miles from this car. Mileage: 45,860 miles. Price: £17,995, £1,583 less than this car. Dealer: ARJ Motors in Addlestone. AskCar page: https://askcar.co.uk/car/audi-a3-2021-39034688bbc9