2020 Audi A3 2.0 TDI S Line

Overview

• Make: Audi
• Model: A3
• Trim: S Line
• Version: 2.0 TDI 35 S Line S tronic FWD Euro 6 (s/s) 4dr (148 bhp)
• Year: 2020
• Mileage: 36,546 miles
• Fuel: Diesel
• Body: Saloon, 4 doors, 5 seats
• Engine: 2.0 litres, 148 bhp
• Gearbox: Automatic (S tronic)
• Drive: Front-wheel drive
• Colour: Grey
• CO2: 124 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2020 Audi A3 S Line is advertised with 36,546 miles, approximately 13,800 below the typical mileage for its age. The dealer is asking £17,480, which is £1,276 below the AskCar estimate of £18,756. To work out the AskCar estimate, we analyse UK dealer adverts for 6,542 Audi A3 cars across different ages and specifications. It first appeared in our advert records 2 days ago. Its advertised mileage matches the government's MOT record. You can find this car at Leigh Cars in Southend-on-SEA. 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: £1,276 (6%) under the AskCar estimate of £18,756.

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 6,542 priced Audi A3 adverts across different ages and specifications, as of 2 November 2026.

A 2020 Audi A3 with the 2.0 diesel engine is typically advertised at £16,800: the median of the 52 for sale on AskCar, as of 2 November 2026.

Time on sale

AskCar first saw this 2020 Audi A3 advertised 2 days ago. About half of 2020 Audi A3 cars are gone from sale within a month of being advertised: 226 of the 433 first advertised between 8 July 2026 and 29 September 2026.

Price history

AskCar first saw this advert on 31 October 2026 at £17,480. 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 29 September 2027.

It has had 4 MOTs. The latest, on 21 September 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 36,188 miles, which matches the advertised 36,546 miles.

Advertised mileage is about 13,800 miles lower than the median mileage of a 2020 Audi A3 on AskCar.

Similar cars

5 other 2020 Audi A3 S Line 2.0 diesel automatic saloons are for sale at UK dealers, from £14,998 to £18,000, as of 2 November 2026.

The 3 closest to this car in mileage:

• 2020 Audi A3 S Line, 2.0 diesel saloon, black. Mileage: 37,600 miles. Price: £18,000, £520 more than this car. Dealer: nucar in Basildon. AskCar page: https://askcar.co.uk/car/audi-a3-2020-bb971cd085d6
• 2020 Audi A3 S Line, 2.0 diesel saloon, blue. Mileage: 45,971 miles. Price: £16,995, £485 less than this car. Dealer: Hitchfields in Huddersfield. AskCar page: https://askcar.co.uk/car/audi-a3-2020-1c5b11733d40
• 2020 Audi A3 S Line, 2.0 diesel saloon, grey. Mileage: 59,508 miles. Price: £16,985, £495 less than this car. Dealer: Listers Birmingham Audi in Birmingham. AskCar page: https://askcar.co.uk/car/audi-a3-2020-6c692897ad01