2021 Audi A4 2.0 TDI S Line
Price: £16,999. Fair price: £695 (3%) under the AskCar estimate of £17,694, our expected asking price for this car from its model, age, mileage and specification, drawing on 1,428 priced Audi A4 adverts on AskCar as of 2 November 2026.
AskCar lists 1,493 used Audi A4 from 984 UK dealerships, as of 2 November 2026.
Overview
- Make: Audi
- Model: A4
- Trim: S Line
- Version: 2.0 TDI S Line S tronic FWD Euro 6 4dr
- Year: 2021
- Mileage: 55,966 miles
- Fuel: Diesel
- Body: Saloon, 4 doors, 5 seats
- Engine: 2.0 litres
- Gearbox: Automatic (S tronic)
- Drive: Front-wheel drive
- Colour: Black
- CO2: 137 g/km
- Emissions standard: Euro 6, ULEZ compliant
About this car
With 55,966 miles on the clock, this 2021 Audi A4 S Line has done roughly 5,800 more miles than a typical 2021 Audi A4. The AskCar estimate for this car is £17,694. It is priced at £16,999, which is £695 below that estimate. To work out the AskCar estimate, we analyse UK dealer adverts for 1,428 Audi A4 cars across different ages and specifications. We have tracked this advert for 6 days. The government's MOT record matches its advertised mileage. You can find this car at Bridgend Motor Group in Leeds. How to contact the dealer and its opening hours are on this AskCar page.
Stock data as of 2 November 2026.
Price
Fair price: £695 (3%) under the AskCar estimate of £17,694.
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 1,428 priced Audi A4 adverts across different ages and specifications, as of 2 November 2026.
A 2021 Audi A4 with the 2.0 diesel engine is typically advertised at £17,100: the median of the 95 for sale on AskCar, as of 2 November 2026.
Time on sale
AskCar first saw this 2021 Audi A4 advertised 6 days ago. About half of 2021 Audi A4 cars are gone from sale within a month of being advertised: 57 of the 115 first advertised between 11 July 2026 and 29 September 2026.
Price history
AskCar first saw this advert on 27 October 2026 at £16,999. 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 14 July 2027.
It has had 4 MOTs. The latest, on 8 July 2026, passed.
There were no advisories at the latest test.
Mileage at that test: 55,613 miles, which matches the advertised 55,966 miles.
Advertised mileage is about 5,800 miles higher than the median mileage of a 2021 Audi A4 on AskCar.
Similar cars
16 other 2021 Audi A4 S Line 2.0 diesel automatic saloons are for sale at UK dealers, from £12,995 to £20,495, as of 2 November 2026.
The 3 closest to this car in mileage:
- 2021 Audi A4 S Line, 2.0 diesel saloon, grey. Mileage: 56,589 miles. Price: £16,998, the same price as this car. Dealer: Used Car Sales Direct Exeter Direct in Exeter. AskCar page: https://askcar.co.uk/car/audi-a4-2021-de7aae9b2de1
- 2021 Audi A4 S Line, 2.0 diesel saloon, blue. Mileage: 56,988 miles. Price: £16,796, £203 less than this car. Dealer: LSH Auto Mercedes-Benz of Stockport in Stockport. AskCar page: https://askcar.co.uk/car/audi-a4-2021-cbda5c14a28a
- 2021 Audi A4 S Line, 2.0 diesel saloon, grey. Mileage: 60,600 miles. Price: £17,250, £251 more than this car. Dealer: Igen Autos in Magherafelt. AskCar page: https://askcar.co.uk/car/audi-a4-2021-400b2694197e
Browse all Audi A4 cars for sale · 2021 Audi A4 price guide
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Photos
7 photos of this car are on its AskCar page.
As of 2 November 2026, AskCar lists 586,270 cars and vans from 12,920 UK dealerships, read daily from dealer websites: over 99% of UK dealer used car adverts. No dealer pays to be listed.