2021 BMW 4 Series 2.0 420i M Sport

Overview

• Make: BMW
• Model: 4 Series
• Trim: M Sport
• Version: 2.0 420i M Sport Auto RWD Euro 6 (s/s) 2dr (181 bhp)
• Year: 2021
• Mileage: 43,305 miles
• Fuel: Petrol
• Body: Convertible, 2 doors, 4 seats
• Engine: 2.0 litres, 181 bhp
• Gearbox: Automatic
• Drive: Rear-wheel drive
• Colour: Black
• CO2: 160 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

The advertised mileage for this 2021 BMW 4 Series M Sport is 43,305 miles. Its asking price of £24,000 is £204 above the AskCar estimate of £23,796. The AskCar estimate uses UK dealer asking prices, including 1,833 BMW 4 Series adverts, and accounts for the car’s age, mileage and specification. We first saw this car advertised 126 days ago. Its asking price has since fallen by £1,500. The government's MOT record matches its advertised mileage. You can find this car at MB Brent Park in London. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 5 November 2026.

How we estimate prices and check cars

Price

Fair price: £204 (under 1%) over the AskCar estimate of £23,796.

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 1,833 priced BMW 4 Series adverts across different ages and specifications, as of 5 November 2026.

A 2021 BMW 4 Series with the 2.0 petrol engine is typically advertised at £24,000: the median of the 149 for sale on AskCar, as of 5 November 2026.

Time on sale

This 2021 BMW 4 Series has been on sale for at least 126 days.

Price history

AskCar first saw this advert on 2 July 2026 at £25,500. Its asking price is now £24,000, £1,500 less. The latest price cut was seen on 13 October 2026.

Price changes recorded:

• 2 July 2026: £25,500
• 9 September 2026: £25,000
• 13 October 2026: £24,000

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 5 November 2026: valid until 30 May 2027.

It has had 3 MOTs. The latest, on 11 May 2026, passed.

Advisories at the latest test: rear brake pad(s) wearing thin.

Mileage at that test: 43,231 miles, which matches the advertised 43,305 miles.

Advertised mileage is about 800 miles lower than the median mileage of a 2021 BMW 4 Series on AskCar.

Similar cars

26 other 2021 BMW 4 Series M Sport 2.0 petrol automatic convertibles are for sale at UK dealers, from £18,990 to £33,950, as of 5 November 2026.

The 3 closest to this car in mileage:

• 2021 BMW 4 Series M Sport, 2.0 petrol convertible, black. Mileage: 42,000 miles. Price: £24,950, £950 more than this car. Dealer: Sovereign Trading in Eastbourne. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-717fbcb098d6
• 2021 BMW 4 Series M Sport, 2.0 petrol convertible, white. Mileage: 41,900 miles. Price: £26,995, £2,995 more than this car. Dealer: Car Monkey in Rawtenstall. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-e74a6040c3cb
• 2021 BMW 4 Series M Sport, 2.0 petrol convertible, green. Mileage: 41,580 miles. Price: £25,895, £1,895 more than this car. Dealer: Century Cars in Turners Hill. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-8fafe0e55cc8

• The nearest: 2021 BMW 4 Series M Sport, 2.0 petrol convertible, green, 7 miles from this car. Mileage: 12,250 miles. Price: £33,950, £9,950 more than this car. Dealer: Kams Cars in Borehamwood. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-aea4aa4c4d93