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: 45,860 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

At 45,860 miles, this 2021 Audi A3 S Line has covered about 2,300 more miles than other 2021 Audi A3 cars. Its asking price of £17,995 is £97 above the AskCar estimate of £17,898. The AskCar estimate draws on 6,542 Audi A3 adverts across the UK, adjusting for age, mileage, trim, engine and other specifications. It first appeared in our advert records 24 days ago. We checked its advertised mileage against the government's MOT record, and they match. It is advertised by ARJ Motors in Addlestone. 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: £97 (under 1%) over the AskCar estimate of £17,898.

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 24 days.

Price history

AskCar first saw this advert on 9 October 2026 at £17,995. 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 3 June 2027.

It failed its MOT on 28 May 2026 (nearside front tyre has a bulge, caused by separation or partial failure of its structure; front brake pad(s) incorrectly mounted; nearside front road wheel fixing missing) and passed 7 days later, on 4 June 2026.

Advisories at the latest test: nearside rear outer tyre has a cut but not deep enough to reach the ply or cords; rear shock absorbers has light misting of oil BOTH SIDES.

Mileage at that test: 43,151 miles, which matches the advertised 45,860 miles.

Advertised mileage is about 2,300 miles higher 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, red. Mileage: 46,087 miles. Price: £17,066, £929 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, black. Mileage: 44,821 miles. Price: £17,699, £296 less than this car. Dealer: Carherts in Aylesbury. AskCar page: https://askcar.co.uk/car/audi-a3-2021-6de78dd713d8
• 2021 Audi A3 S Line, 1.5 petrol hatchback, blue. Mileage: 44,578 miles. Price: £17,660, £335 less than this car. Dealer: Big Motoring World Blue Bell Hill in Blue Bell Hill. AskCar page: https://askcar.co.uk/car/audi-a3-2021-974335f973f0

• The nearest: 2021 Audi A3 S Line, 1.5 petrol hatchback, black, 8 miles from this car. Mileage: 29,145 miles. Price: £19,578, £1,583 more than this car. Dealer: Lookers Audi Guildford in Guildford. AskCar page: https://askcar.co.uk/car/audi-a3-2021-6fff69d3d17b