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: 47,445 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

With 47,445 miles on the clock, this 2021 Audi A3 S Line has done roughly 4,200 more miles than a typical 2021 Audi A3. Its asking price of £18,240 is £590 above the AskCar estimate of £17,650. To work out the AskCar estimate, we analyse UK dealer adverts for 6,630 Audi A3 cars across different ages and specifications. This car was first seen in our listings data 6 days ago. The government's MOT record matches its advertised mileage. It is advertised by Vehicle Select in Bolton. 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: £590 (3%) over the AskCar estimate of £17,650.

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 6 days 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 29 October 2026 at £17,880. Its asking price is now £18,240, £360 more.

Price changes recorded:

• 29 October 2026: £17,880
• 4 November 2026: £18,240

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 4 November 2026: valid until 11 November 2026.

It failed its MOT on 3 November 2025 (nearside front tyre has ply or cords exposed; offside front tyre has a cut in excess of the requirements deep enough to reach the ply or cords; nearside rear tyre tread depth below requirements of 1.6mm) and passed later the same day.

Advisories at the latest test: central front front grill smashed with sharp edges but not likely to catch your self on it.

Mileage at that test: 42,388 miles, which matches the advertised 47,445 miles.

Advertised mileage is about 4,200 miles higher 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, white. Mileage: 48,200 miles. Price: £16,850, £1,390 less than this car. Dealer: Evans Halshaw Ford Motherwell in Motherwell. AskCar page: https://askcar.co.uk/car/audi-a3-2021-1e9202be6004
• 2021 Audi A3 S Line, 1.5 petrol hatchback, red. Mileage: 46,087 miles. Price: £16,959, £1,281 less than this car. Dealer: Carsa Cannock in Cannock. AskCar page: https://askcar.co.uk/car/audi-a3-2021-5c2ab42d2bcf
• 2021 Audi A3 S Line, 1.5 petrol hatchback, grey. Mileage: 45,860 miles. Price: £17,995, £245 less than this car. Dealer: ARJ Motors in Addlestone. AskCar page: https://askcar.co.uk/car/audi-a3-2021-39034688bbc9

• The nearest: 2021 Audi A3 S Line, 1.5 petrol hatchback, grey, 3 miles from this car. Mileage: 18,150 miles. Price: £20,300, £2,060 more than this car. Dealer: ZG Prestige in Bolton. AskCar page: https://askcar.co.uk/car/audi-a3-2021-42afac1d3832