2021 Audi A3 1.5 TFSI S Line

Version: 1.5 TFSI 35 S Line S tronic FWD Euro 6 (s/s) 5dr Sportback (148 bhp)

Price: £17,880. Fair price: £148 (under 1%) over the AskCar estimate of £17,732, our expected asking price for this car from its model, age, mileage and specification, drawing on 6,508 priced Audi A3 adverts on AskCar as of 29 October 2026.

AskCar lists 6,724 used Audi A3 from 2,304 UK dealerships, as of 29 October 2026.

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)
Mileage
47,445 miles
Year
2021
Fuel type
Petrol
Body type
Hatchback
Engine
1.5 L
Gearbox
Automatic
Power
148 bhp
Seats
5
CO2
135 g/km
Colour
Grey
Doors
5
Driven wheels
Front Wheel Drive
Gearbox version
S tronic
Engine badge
TFSI
Hybrid type
Mild hybrid
Emissions standard
Euro 6

About this car

With 47,445 miles on the clock, this 2021 Audi A3 S Line has done roughly 3,900 more miles than a typical 2021 Audi A3. Its asking price of £17,880 is £148 above the AskCar estimate of £17,732. To work out the AskCar estimate, we analyse UK dealer adverts for 6,508 Audi A3 cars across different ages and specifications. It first appeared in our advert records today. MOT records show an expiry date of 11 November 2026, and the latest recorded mileage is consistent with the advert. It is advertised by Vehicle Select in Bolton.

Stock data as of 29 October 2026.

How we estimate prices and check cars

Price history

AskCar first saw this advert on 29 October 2026.

Recorded asking prices
Date observedAsking price
29 October 2026£17,880

Price and mileage comparison

Fair price: £148 (under 1%) over the AskCar estimate of £17,732.

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 6,508 priced Audi A3 adverts across different ages and specifications, as of 29 October 2026.

Advertised mileage is about 3,900 miles higher than the median mileage of a 2021 Audi A3 on AskCar.

The advertised mileage is consistent with the last MOT reading.

MOT

MOT: valid until 11 November 2026. 42,388 miles at the last test.

Other matching cars

98 other 2021 Audi A3 S Line automatic petrol cars are for sale at UK dealers from £11,990 to £21,995, as of 29 October 2026.

The 5 cheapest:

The 98 matching cars have covered 11,900 to 120,530 miles, compared with 47,445 miles for this car.

Matching year, trim, gearbox and fuel does not mean matching mileage or every specification. The AskCar estimate adjusts for these differences.

Browse all Audi A3 cars for sale · 2021 Audi A3 price guide

More like this

Photos

36 photos of this car are on its AskCar page.

How to contact the dealer and its opening hours are on this AskCar page.

As of 29 October 2026, AskCar lists 587,923 cars and vans from 12,992 UK dealerships, read daily from dealer websites: over 99% of UK dealer used car adverts. No dealer pays to be listed.