2021 Audi A4 2.0 TDI S Line

Overview

• Make: Audi
• Model: A4
• Trim: S Line
• Version: 2.0 TDI S Line S tronic FWD Euro 6 4dr (160 bhp)
• Year: 2021
• Mileage: 78,000 miles
• Fuel: Diesel
• Body: Saloon, 4 doors, 5 seats
• Engine: 2.0 litres, 160 bhp
• Gearbox: Automatic (S tronic)
• Drive: Front-wheel drive
• Colour: White
• CO2: 137 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 Audi A4 S Line is advertised with 78,000 miles, approximately 27,800 above the typical mileage for its age. The AskCar estimate for this car is £14,805. It is priced at £15,000, which is £195 above that estimate. The AskCar estimate uses 1,427 UK dealer adverts for the Audi A4, with adjustments for age, mileage, trim, engine and other specifications. We first saw this car advertised 51 days ago. Its asking price has since fallen by £1,000. We checked its advertised mileage against the government's MOT record, and they match. It is advertised by Mylson Stoke in Newcastle-Under-Lyme. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 4 November 2026.

How we estimate prices and check cars

Price

Fair price: £195 (1%) over the AskCar estimate of £14,805.

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 diesel 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 51 days.

Price history

AskCar first saw this advert on 14 September 2026 at £16,000. Its asking price is now £15,000, £1,000 less. The latest price cut was seen on 4 November 2026.

Price changes recorded:

• 14 September 2026: £16,000
• 27 September 2026: £16,500
• 15 October 2026: £16,000
• 21 October 2026: £15,750
• 27 October 2026: £15,500
• 4 November 2026: £15,000

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 4 November 2026: valid until 11 April 2027.

It failed its MOT on 30 March 2026 (nearside front tyre has a bulge, caused by separation or partial failure of its structure) and passed 3 days later, on 2 April 2026.

Advisories at the latest test: offside rear tyre worn close to legal limit/worn on edge.

Mileage at that test: 73,629 miles, which matches the advertised 78,000 miles.

Advertised mileage is about 27,800 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 4 November 2026.

The 3 closest to this car in mileage:

• 2021 Audi A4 S Line, 2.0 diesel saloon, white. Mileage: 69,960 miles. Price: £15,498, £498 more than this car. Dealer: Arnold Clark Cumbernauld Kia in Cumbernauld. AskCar page: https://askcar.co.uk/car/audi-a4-2021-f489aca9ff93
• 2021 Audi A4 S Line, 2.0 diesel saloon, black. Mileage: 64,000 miles. Price: £16,769, £1,769 more than this car. Dealer: Newarth Car Sales in Worsley. AskCar page: https://askcar.co.uk/car/audi-a4-2021-4f6db3642494
• 2021 Audi A4 S Line, 2.0 diesel saloon, white. Mileage: 62,800 miles. Price: £16,693, £1,693 more than this car. Dealer: Aylesbury Trade Centre in Aston Clinton. AskCar page: https://askcar.co.uk/car/audi-a4-2021-ed55683643f9

• The nearest: 2021 Audi A4 S Line, 2.0 diesel saloon, blue, 26 miles from this car. Mileage: 56,988 miles. Price: £16,796, £1,796 more than this car. Dealer: LSH Auto Mercedes-Benz of Stockport in Stockport. AskCar page: https://askcar.co.uk/car/audi-a4-2021-cbda5c14a28a