2021 Audi A4 2.0 TFSI S Line
Price: £17,498. Fair price: £864 (5%) over the AskCar estimate of £16,634, our expected asking price for this car from its model, age, mileage and specification, drawing on 1,427 priced Audi A4 adverts on AskCar as of 4 November 2026.
AskCar lists 1,488 used Audi A4 from 972 UK dealerships, as of 4 November 2026.
Overview
- Make: Audi
- Model: A4
- Trim: S Line
- Version: 2.0 TFSI 35 S Line S tronic FWD Euro 6 (s/s) 4dr (148 bhp)
- Year: 2021
- Mileage: 48,709 miles
- Fuel: Petrol
- Body: Saloon, 4 doors, 5 seats
- Engine: 2.0 litres, 148 bhp
- Gearbox: Automatic (S tronic)
- Drive: Front-wheel drive
- Colour: Blue
- CO2: 154 g/km
- Emissions standard: Euro 6, ULEZ compliant
About this car
This 2021 Audi A4 S Line is advertised with 48,709 miles on the clock. Priced at £17,498, it is advertised £864 above the AskCar estimate of £16,634. To work out the AskCar estimate, we analyse UK dealer adverts for 1,427 Audi A4 cars across different ages and specifications. We first recorded this car for sale 35 days ago. Its advertised mileage matches the government's MOT record. It is advertised by Arnold Clark Lenzie Vauxhall in Glasgow. How to contact the dealer and its opening hours are on this AskCar page.
Stock data as of 4 November 2026.
Price
Fair price: £864 (5%) over the AskCar estimate of £16,634.
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 1,427 priced Audi A4 adverts across different ages and specifications, as of 4 November 2026.
A 2021 Audi A4 with the 2.0 petrol engine is typically advertised at £17,100: the median of the 95 for sale on AskCar, as of 4 November 2026.
Time on sale
This 2021 Audi A4 has been on sale for at least 35 days.
Price history
AskCar first saw this advert on 30 September 2026 at £16,998. Its asking price is now £17,498, £500 more.
Price changes recorded:
- 30 September 2026: £16,998
- 9 October 2026: £17,498
Mileage and MOT
MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 4 November 2026: valid until 24 September 2027.
It failed its MOT on 25 September 2026 (offside front windscreen wiper does not clear the windscreen effectively) and passed later the same day.
Advisories at the latest test: front brake pad(s) wearing thin.
Mileage at that test: 48,715 miles, which matches the advertised 48,709 miles.
Advertised mileage is about 1,500 miles lower than the median mileage of a 2021 Audi A4 on AskCar.
Similar cars
6 other 2021 Audi A4 S Line 2.0 petrol automatic saloons are for sale at UK dealers, from £15,000 to £21,745, as of 4 November 2026.
The 3 closest to this car in mileage:
- 2021 Audi A4 S Line, 2.0 petrol saloon, black. Mileage: 47,400 miles. Price: £17,490, the same price as this car. Dealer: Stow Car Company in Chelmsford. AskCar page: https://askcar.co.uk/car/audi-a4-2021-16627277c0b6
- 2021 Audi A4 S Line, 2.0 petrol saloon, white. Mileage: 33,568 miles. Price: £19,999, £2,501 more than this car. Dealer: Bridgend Motor Group in Gateshead. AskCar page: https://askcar.co.uk/car/audi-a4-2021-3dc8fc35c99a
- 2021 Audi A4 S Line, 2.0 petrol saloon, grey. Mileage: 27,162 miles. Price: £18,200, £702 more than this car. Dealer: Car Planet Watford in Watford. AskCar page: https://askcar.co.uk/car/audi-a4-2021-b955fd89d49e
Browse all Audi A4 cars for sale · 2021 Audi A4 price guide
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Photos
20 photos of this car are on its AskCar page.
As of 4 November 2026, AskCar lists 592,552 cars and vans from 12,964 UK dealerships, read daily from dealer websites: over 99% of UK dealer used car adverts. No dealer pays to be listed.