2021 Audi A3 1.5 TFSI S Line

Overview

• Make: Audi
• Model: A3
• Trim: S Line
• Version: 1.5 TFSI 35 S Line Manual FWD Euro 6 (s/s) 5dr Sportback (148 bhp)
• Year: 2021
• Mileage: 42,370 miles
• Fuel: Petrol
• Body: Hatchback, 5 doors, 5 seats
• Engine: 1.5 litres, 148 bhp
• Gearbox: Manual
• Drive: Front-wheel drive
• Colour: Grey
• CO2: 136 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 Audi A3 S Line has covered 42,370 miles. Its asking price of £16,490 is £83 below the AskCar estimate of £16,573. The AskCar estimate uses UK dealer asking prices, including 6,542 Audi A3 adverts, and accounts for the car’s age, mileage and specification. This car was first seen in our listings data today. According to the government's MOT record, its advertised mileage is consistent with the latest test. The seller is Stratstone Amersham Audi, based in Amersham. 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: £83 (under 1%) under the AskCar estimate of £16,573.

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 today. 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 2 November 2026 at £16,490. 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 6 November 2027.

It has had 3 MOTs. The latest, on 24 October 2026, passed.

Advisories at the latest test: nearside front tyre has a cut but not deep enough to reach the ply or cords; offside front tyre has a cut but not deep enough to reach the ply or cords.

Mileage at that test: 42,370 miles, which matches the advertised 42,370 miles.

Advertised mileage is about 1,200 miles lower than the median mileage of a 2021 Audi A3 on AskCar.

Similar cars

20 other 2021 Audi A3 S Line 1.5 petrol manual hatchbacks are for sale at UK dealers, from £12,895 to £18,490, as of 2 November 2026.

The 3 closest to this car in mileage:

• 2021 Audi A3 S Line, 1.5 petrol hatchback, blue. Mileage: 42,466 miles. Price: £16,050, £440 less than this car. Dealer: Hilton Garage in Derby. AskCar page: https://askcar.co.uk/car/audi-a3-2021-891d89d7ab9c
• 2021 Audi A3 S Line, 1.5 petrol hatchback, red. Mileage: 44,353 miles. Price: £15,680, £810 less than this car. Dealer: Big Motoring World Norwich in Norwich. AskCar page: https://askcar.co.uk/car/audi-a3-2021-708ae2fe8670
• 2021 Audi A3 S Line, 1.5 petrol hatchback, white. Mileage: 44,792 miles. Price: £15,710, £780 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-d76776fc4f0b

• The nearest: 2021 Audi A3 S Line, 1.5 petrol hatchback, red, 34 miles from this car. Mileage: 39,260 miles. Price: £16,394, £96 less than this car. Dealer: cinch in Bexley. AskCar page: https://askcar.co.uk/car/audi-a3-2021-89db664f157c