2021 Audi A4 2.0 TFSI S Line
Price: £18,200. Fair price: £464 (2%) under the AskCar estimate of £18,664, 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 TFSI 35 S Line S tronic FWD Euro 6 (s/s) 4dr (148 bhp)
- Year: 2021
- Mileage: 27,162 miles
- Fuel: Petrol
- Body: Saloon, 4 doors, 5 seats
- Engine: 2.0 litres, 148 bhp
- Gearbox: Automatic (S tronic)
- Drive: Front-wheel drive
- Colour: Grey
- CO2: 154 g/km
- Emissions standard: Euro 6, ULEZ compliant
About this car
This 2021 Audi A4 S Line is advertised with 27,162 miles, approximately 23,000 below the typical mileage for its age. Priced at £18,200, it is advertised £464 below the AskCar estimate of £18,664. To work out the AskCar estimate, we analyse UK dealer adverts for 1,428 Audi A4 cars across different ages and specifications. This car was first seen in our listings data 5 days ago. Its advertised mileage matches the government's MOT record. It is advertised by Car Planet Watford in Rickmansworth. How to contact the dealer and its opening hours are on this AskCar page.
Stock data as of 2 November 2026.
Price
Fair price: £464 (2%) under the AskCar estimate of £18,664.
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 petrol 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 5 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 28 October 2026 at £18,200. 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 8 February 2027.
It has had 4 MOTs. The latest, on 28 October 2026, passed.
There were no advisories at the latest test.
Mileage at that test: 27,157 miles, which matches the advertised 27,162 miles.
Advertised mileage is about 23,000 miles lower than the median mileage of a 2021 Audi A4 on AskCar.
Similar cars
8 other 2021 Audi A4 S Line 2.0 petrol automatic saloons are for sale at UK dealers, from £14,295 to £21,945, as of 2 November 2026.
The 3 closest to this car in mileage:
- 2021 Audi A4 S Line, 2.0 petrol saloon, black. Mileage: 25,865 miles. Price: £17,100, £1,100 less than this car. Dealer: Car Planet Watford in Watford. AskCar page: https://askcar.co.uk/car/audi-a4-2021-8f18484fdadf
- 2021 Audi A4 S Line, 2.0 petrol saloon, white. Mileage: 33,568 miles. Price: £19,999, £1,799 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, black. Mileage: 16,701 miles. Price: £18,749, £549 more than this car. Dealer: Motorpoint Chingford in Chingford. AskCar page: https://askcar.co.uk/car/audi-a4-2021-f061aad049eb
Browse all Audi A4 cars for sale · 2021 Audi A4 price guide
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Photos
35 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.