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: 24,000 miles
• Fuel: Petrol
• Body: Convertible, 2 doors, 4 seats
• Engine: 2.0 litres, 181 bhp
• Gearbox: Automatic
• Drive: Rear-wheel drive
• Colour: White
• CO2: 160 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

At 24,000 miles, this 2021 BMW 4 Series M Sport has covered about 20,100 fewer miles than other 2021 BMW 4 Series cars. The dealer is asking £26,495, which is £175 above the AskCar estimate of £26,320. To work out the AskCar estimate, we analyse UK dealer adverts for 1,833 BMW 4 Series cars across different ages and specifications. It first appeared in our advert records 2 days ago. The government's MOT record matches its advertised mileage. It is advertised by West Motor Company Kingston in New Malden. 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: £175 (under 1%) over the AskCar estimate of £26,320.

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

AskCar first saw this 2021 BMW 4 Series advertised 2 days ago. About 4 in 10 of 2021 BMW 4 Series cars are gone from sale within a month of being advertised: 103 of the 246 first advertised between 11 July 2026 and 2 October 2026.

Price history

AskCar first saw this advert on 3 November 2026 at £26,495. 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 5 November 2026: valid until 4 June 2027.

It has had 3 MOTs. The latest, on 16 May 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 22,289 miles, which matches the advertised 24,000 miles.

Advertised mileage is about 20,100 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, blue. Mileage: 24,899 miles. Price: £26,895, £400 more than this car. Dealer: Century Cars in Turners Hill. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-7b8b9a6a1c14
• 2021 BMW 4 Series M Sport, 2.0 petrol convertible, black. Mileage: 22,399 miles. Price: £27,195, £700 more than this car. Dealer: John Clark BMW Tayside in Dundee. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-9751e81829b1
• 2021 BMW 4 Series M Sport, 2.0 petrol convertible, white. Mileage: 28,848 miles. Price: £27,799, £1,304 more than this car. Dealer: Hendy Ford Redhill in Redhill. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-e62e3bdb919c

• The nearest: 2021 BMW 4 Series M Sport, 2.0 petrol convertible, black, 11 miles from this car. Mileage: 43,305 miles. Price: £24,000, £2,495 less than this car. Dealer: MB Brent Park in London. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-fb7d7a051e27