2021 Audi A3 1.0 TFSI S Line

Overview

• Make: Audi
• Model: A3
• Trim: S Line
• Version: 1.0 TFSI 30 S Line Manual FWD Euro 6 (s/s) 4dr (108 bhp)
• Year: 2021
• Mileage: 24,833 miles
• Fuel: Petrol
• Body: Saloon, 4 doors, 5 seats
• Engine: 1.0 litres, 108 bhp
• Gearbox: Manual
• Drive: Front-wheel drive
• Colour: Black
• CO2: 128 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 Audi A3 S Line has covered 24,833 miles, around 18,800 fewer miles than is typical for its age. The dealer is asking £17,990, which is £774 above the AskCar estimate of £17,216. To work out the AskCar estimate, we analyse UK dealer adverts for 6,542 Audi A3 cars across different ages and specifications. This car was first seen in our listings data 23 days ago. Its advertised mileage matches the government's MOT record. The seller is Agnew Group Belfast Audi, based in Belfast. 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: £774 (4%) over the AskCar estimate of £17,216.

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 1.0 petrol engine is typically advertised at £15,000: the median of the 87 for sale on AskCar, as of 2 November 2026.

Time on sale

This 2021 Audi A3 has been on sale for at least 23 days.

Price history

AskCar first saw this advert on 10 October 2026 at £17,990. 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 23 May 2027.

It has had one MOT, on 17 May 2025, and passed.

There were no advisories at the latest test.

Mileage at that test: 20,522 miles, which matches the advertised 24,833 miles.

Advertised mileage is about 18,800 miles lower than the median mileage of a 2021 Audi A3 on AskCar.

Similar cars

11 other 2021 Audi A3 S Line 1.0 petrol manual saloons are for sale at UK dealers, from £13,299 to £17,300, as of 2 November 2026.

The 3 closest to this car in mileage:

• 2021 Audi A3 S Line, 1.0 petrol saloon, black. Mileage: 17,547 miles. Price: £17,300, £690 less than this car. Dealer: Big Motoring World Sheffield in Sheffield. AskCar page: https://askcar.co.uk/car/audi-a3-2021-4a400fa88e2e
• 2021 Audi A3 S Line, 1.0 petrol saloon, black. Mileage: 33,574 miles. Price: £15,590, £2,400 less than this car. Dealer: Carcart in Willenhall. AskCar page: https://askcar.co.uk/car/audi-a3-2021-62935ace8378
• 2021 Audi A3 S Line, 1.0 petrol saloon, grey. Mileage: 35,018 miles. Price: £16,199, £1,791 less than this car. Dealer: cinch Corby in Corby. AskCar page: https://askcar.co.uk/car/audi-a3-2021-61cc72f32564

• The nearest: 2021 Audi A3 S Line, 1.0 petrol saloon, white, 80 miles from this car. Mileage: 36,142 miles. Price: £16,499, £1,491 less than this car. Dealer: Bridgend Motor Group, Ayr in Prestwick. AskCar page: https://askcar.co.uk/car/audi-a3-2021-ebf04dbd6eaa