2021 Audi A5 2.0 TDI S Line

Overview

• Make: Audi
• Model: A5
• Trim: S Line
• Version: 2.0 TDI S Line S tronic Euro 6 5dr
• Year: 2021
• Mileage: 51,429 miles
• Fuel: Diesel, mild hybrid
• Body: Hatchback, 5 doors, 5 seats
• Engine: 2.0 litres
• Gearbox: Automatic (S tronic)
• Colour: Blue
• CO2: 146 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 Audi A5 S Line has covered 51,429 miles. The dealer is asking £21,798, which is £1,507 above the AskCar estimate of £20,291. To work out the AskCar estimate, we analyse UK dealer adverts for 1,830 Audi A5 cars across different ages and specifications. The dealer may accept less. This car has been on sale for at least 114 days. Its advertised mileage matches the government's MOT record. The seller is Arnold Clark Liverpool Motorstore / MG / Chery, based in Liverpool. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 2 November 2026.

How we estimate prices and check cars

Price

Fair price: £1,507 (7%) over the AskCar estimate of £20,291.

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 1,830 priced Audi A5 adverts across different ages and specifications, as of 2 November 2026.

A 2021 Audi A5 with the 2.0 diesel engine is typically advertised at £19,700: the median of the 119 for sale on AskCar, as of 2 November 2026.

Time on sale

The dealer may accept less. This 2021 Audi A5 has been on sale for at least 114 days. About half of 2021 Audi A5 cars are gone from sale within a month of being advertised: 84 of the 157 first advertised between 8 July 2026 and 29 September 2026.

Price history

AskCar first saw this advert on 11 July 2026 at £21,798. 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 2 June 2027.

It failed its MOT on 3 June 2026 (front inner tyre tread depth below requirements of 1.6mm both front tyres worn on inner three quarters,; engine MIL inoperative or indicates a malfunction) and passed later the same day.

Advisories at the latest test: front front number plate damaged but not likely to be misread; nearside front lower suspension arm pin or bush worn but not resulting in excessive movement.

Mileage at that test: 51,276 miles, which matches the advertised 51,429 miles.

Advertised mileage is about 400 miles higher than the median mileage of a 2021 Audi A5 on AskCar.

Similar cars

30 other 2021 Audi A5 S Line 2.0 diesel automatic hatchbacks are for sale at UK dealers, from £13,995 to £22,990, as of 2 November 2026.

The 3 closest to this car in mileage:

• 2021 Audi A5 S Line, 2.0 diesel hatchback, blue. Mileage: 51,000 miles. Price: £21,500, £298 less than this car. Dealer: PMA Cars NI in Newry. AskCar page: https://askcar.co.uk/car/audi-a5-2021-00c6bfd32934
• 2021 Audi A5 S Line, 2.0 diesel hatchback, grey. Mileage: 53,000 miles. Price: £20,000, £1,798 less than this car. Dealer: Plympton Car Centre (Plymouth) in Plympton. AskCar page: https://askcar.co.uk/car/audi-a5-2021-bbc648e4f41c
• 2021 Audi A5 S Line, 2.0 diesel hatchback, white. Mileage: 49,578 miles. Price: £19,999, £1,799 less than this car. Dealer: Bridgend Motor Group in Morley. AskCar page: https://askcar.co.uk/car/audi-a5-2021-0cb292798da0

• The nearest: 2021 Audi A5 S Line, 2.0 diesel hatchback, white, 26 miles from this car. Mileage: 39,000 miles. Price: £19,995, £1,803 less than this car. Dealer: Wallace Car Sales in Bolton. AskCar page: https://askcar.co.uk/car/audi-a5-2021-e1e1b8d9ff27