2021 Audi A3

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

£20,477

Fair price: within 8% of the typical £20,788 for this model, age and mileage, drawing on 6,532 adverts of this make and model.

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: 16,057 miles
Year: 2021
Fuel type: Petrol Hybrid
Body type: Hatchback
Engine: 1.5 L
Gearbox: Automatic
Power: 148 bhp
Seats: 5
CO2: 135 g/km
Colour: Blue
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

This 2021 Audi A3 S Line is advertised with 16,057 miles, approximately 26,900 below the typical mileage for its age. The dealer is asking £20,477, which is £311 below our market estimate of £20,788. Our estimate draws on 6,532 Audi A3 adverts across the UK, adjusting for age, mileage, trim, engine and other specifications. This car was first seen in our listings data 5 days ago. MOT records show an expiry date of 24 October 2027, and the latest recorded mileage is consistent with the advert. The seller is CarSupermarket.com Barnsley, based in Barnsley.

Stock data from 20 October 2026.

How we estimate prices and check cars

Price history

First seen on 17 October 2026, 5 days ago. Advert duration calculated on 22 October 2026.

Recorded asking prices
Date observed	Asking price
17 October 2026	£20,477
20 October 2026	£20,477

Price and mileage comparison

Estimated market asking price: £20,788. The asking price is £311 below this estimate.

The estimate uses UK dealer asking prices, accounting for make, model, trim, version, age, mileage, fuel, gearbox, body type, driven wheels, engine size and power. It estimates an advertised price, not a confirmed sale price.

The pricing calculation includes 6,532 adverts of this make and model across different ages and specifications.

Advertised mileage is approximately 26,900 miles lower than typical for a 2021 Audi A3.

The advertised mileage is consistent with the last MOT reading.

MOT

MOT valid until 24 October 2027. 15,966 miles at the last test.

98 other cars with the same year, trim, gearbox and fuel are for sale from £11,995 to £21,995.

Other matching cars (up to five, cheapest first)
Asking price	Mileage
£11,995	120,530 miles
£12,490	111,668 miles
£12,995	108,000 miles
£12,999	57,000 miles
£13,290	108,000 miles

These cars have covered 11,900–120,530 miles, compared with 16,057 miles for this car.

Matching year, trim, gearbox and fuel does not mean matching mileage or every specification. Our estimate adjusts for these differences using the wider market data.

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

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Dealer

CarSupermarket.com Barnsley, Barnsley. Across the dealer network: 14 branches, 1,360 cars for sale.

Dealer postcode: S70 5SZ.

Dealer opening hours

Monday: 08:30-20:00
Tuesday: 08:30-20:00
Wednesday: 08:30-20:00
Thursday: 08:30-20:00
Friday: 08:30-20:00
Saturday: 08:30-17:30
Sunday: 10:00-16:00