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: 50,342 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: Black
• CO2: 131 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 Audi A3 S Line has covered 50,342 miles, around 6,700 more miles than is typical for its age. The AskCar estimate for this car is £17,534. It is priced at £18,150, which is £616 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 have tracked this advert for 6 days. According to the government's MOT record, its advertised mileage is consistent with the latest test. The seller is Group 1 Automotive Southend Audi, based in Southend. 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: £616 (3%) over the AskCar estimate of £17,534.

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

AskCar first saw this 2021 Audi A3 advertised 6 days ago. About 6 in 10 of 2021 Audi A3 cars are gone from sale within a month of being advertised: 403 of the 709 first advertised between 7 July 2026 and 29 September 2026.

Price history

AskCar first saw this advert on 27 October 2026 at £18,150. 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 8 May 2027.

It has had 3 MOTs. The latest, on 5 May 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 43,803 miles, which matches the advertised 50,342 miles.

Advertised mileage is about 6,700 miles higher 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, black. Mileage: 51,176 miles. Price: £17,495, £655 less than this car. Dealer: NSA Motor Vehicles in Milton Keynes. AskCar page: https://askcar.co.uk/car/audi-a3-2021-b5efd633c8fb
• 2021 Audi A3 S Line, 1.5 petrol saloon, grey. Mileage: 53,412 miles. Price: £17,250, £900 less than this car. Dealer: Vertu Honda Stockton in Stockton-on-Tees. AskCar page: https://askcar.co.uk/car/audi-a3-2021-cd7c671bba5d
• 2021 Audi A3 S Line, 1.5 petrol saloon, black. Mileage: 55,000 miles. Price: £17,304, £846 less than this car. Dealer: Shepshed Ford in Shepshed. AskCar page: https://askcar.co.uk/car/audi-a3-2021-eae480dfac43

• The nearest: 2021 Audi A3 S Line, 1.5 petrol saloon, grey, 23 miles from this car. Mileage: 79,653 miles. Price: £15,495, £2,655 less than this car. Dealer: Motor Link London in London. AskCar page: https://askcar.co.uk/car/audi-a3-2021-de221815c838