2021 Audi A3 1.5 TFSI S Line

Overview

• Make: Audi
• Model: A3
• Trim: S Line
• Version: 1.5 TFSI 35 S Line S tronic FWD Euro 6 (s/s) 5dr Sportback (148 bhp)
• Year: 2021
• Mileage: 40,655 miles
• Fuel: Petrol, mild hybrid
• Body: Hatchback, 5 doors, 5 seats
• Engine: 1.5 litres, 148 bhp
• Gearbox: Automatic (S tronic)
• Drive: Front-wheel drive
• Colour: Black
• CO2: 135 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

At 40,655 miles, this 2021 Audi A3 S Line has covered about 2,900 fewer miles than other 2021 Audi A3 cars. The dealer is asking £17,995, which is £410 below the AskCar estimate of £18,405. To work out the AskCar estimate, we analyse UK dealer adverts for 6,542 Audi A3 cars across different ages and specifications. The dealer may accept less: this car has been on sale for at least 137 days. We checked its advertised mileage against the government's MOT record, and they match. It is for sale at Taunton Road Car Centre in Bridgwater. 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: £410 (2%) under the AskCar estimate of £18,405.

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 2021 Audi A3 with the 1.5 petrol engine is typically advertised at £18,000: the median of the 191 for sale on AskCar, as of 2 November 2026.

Time on sale

The dealer may accept less. This 2021 Audi A3 has been on sale for at least 137 days. About 6 in 10 of 2021 Audi A3 cars are gone from sale within a month of being advertised: 403 of the 709 first advertised between 7 July 2026 and 29 September 2026.

Price history

AskCar first saw this advert on 18 June 2026 at £17,995. 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 30 November 2026.

It has had 2 MOTs. The latest, on 1 December 2025, passed.

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

Mileage at that test: 37,304 miles, which matches the advertised 40,655 miles.

Advertised mileage is about 2,900 miles lower than the median mileage of a 2021 Audi A3 on AskCar.

Similar cars

49 other 2021 Audi A3 S Line 1.5 petrol automatic hatchbacks are for sale at UK dealers, from £11,990 to £21,995, as of 2 November 2026.

The 3 closest to this car in mileage:

• 2021 Audi A3 S Line, 1.5 petrol hatchback, white. Mileage: 40,663 miles. Price: £19,014, £1,019 more than this car. Dealer: Lookers Audi Wearside in Sunderland. AskCar page: https://askcar.co.uk/car/audi-a3-2021-26c3e7fac143
• 2021 Audi A3 S Line, 1.5 petrol hatchback, blue. Mileage: 41,000 miles. Price: £18,995, £1,000 more than this car. Dealer: Grampian Cars in Macduff. AskCar page: https://askcar.co.uk/car/audi-a3-2021-ff4ecb3467fe
• 2021 Audi A3 S Line, 1.5 petrol hatchback, grey. Mileage: 41,270 miles. Price: £17,507, £488 less than this car. Dealer: Cargem in Rainham. AskCar page: https://askcar.co.uk/car/audi-a3-2021-43f7591315bd

• The nearest: 2021 Audi A3 S Line, 1.5 petrol hatchback, black, 16 miles from this car. Mileage: 33,794 miles. Price: £18,301, £306 more than this car. Dealer: Carbase Weston-super-Mare in Weston-super-Mare. AskCar page: https://askcar.co.uk/car/audi-a3-2021-b7a2c17f64a6