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: 53,412 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: Grey
• CO2: 131 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

At 53,412 miles, this 2021 Audi A3 S Line has covered about 9,800 more miles than other 2021 Audi A3 cars. The AskCar estimate for this car is £17,247. It is priced at £17,250, which is £3 above that estimate. The AskCar estimate uses 6,542 UK dealer adverts for the Audi A3, with adjustments for age, mileage, trim, engine and other specifications. We have tracked this advert for 19 days. Its advertised mileage matches the government's MOT record. It is for sale at Vertu Honda Stockton in Stockton-on-Tees. 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: £3 (under 1%) over the AskCar estimate of £17,247.

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 19 days.

Price history

AskCar first saw this advert on 14 October 2026 at £17,008. Its asking price is now £17,250, £242 more.

Price changes recorded:

• 14 October 2026: £17,008
• 16 October 2026: £16,963
• 17 October 2026: £16,959
• 18 October 2026: £16,935
• 20 October 2026: £17,268
• 21 October 2026: £17,274
• 22 October 2026: £17,260
• 23 October 2026: £17,250

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 2 November 2026: valid until 1 October 2027.

It has had 4 MOTs. The latest, on 2 October 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 50,677 miles, which matches the advertised 53,412 miles.

Advertised mileage is about 9,800 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: 55,000 miles. Price: £17,304, £54 more than this car. Dealer: Shepshed Ford in Shepshed. AskCar page: https://askcar.co.uk/car/audi-a3-2021-eae480dfac43
• 2021 Audi A3 S Line, 1.5 petrol saloon, black. Mileage: 51,176 miles. Price: £17,495, £245 more 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, black. Mileage: 50,342 miles. Price: £18,150, £900 more than this car. Dealer: Group 1 Automotive Southend Audi in Thundersley and South Benfleet. AskCar page: https://askcar.co.uk/car/audi-a3-2021-ebf6ec9bf222

• The nearest: 2021 Audi A3 S Line, 1.5 petrol saloon, black, 5 miles from this car. Mileage: 43,056 miles. Price: £17,230, the same price as this car. Dealer: Evans Halshaw Ford Middlesbrough in Middlesbrough. AskCar page: https://askcar.co.uk/car/audi-a3-2021-b2308c40c33d