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: 24,899 miles
• Fuel: Petrol
• Body: Convertible, 2 doors, 4 seats
• Engine: 2.0 litres, 181 bhp
• Gearbox: Automatic
• Drive: Rear-wheel drive
• Colour: Blue
• CO2: 160 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

At 24,899 miles, this 2021 BMW 4 Series M Sport has covered about 19,200 fewer miles than other 2021 BMW 4 Series cars. Priced at £26,895, it is advertised £680 above the AskCar estimate of £26,215. 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 75 days ago. Its asking price has since fallen by £1,400. We checked its advertised mileage against the government's MOT record, and they match. The seller is Century Cars, based in Crawley. 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: £680 (2%) over the AskCar estimate of £26,215.

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 75 days.

Price history

AskCar first saw this advert on 22 August 2026 at £28,295. Its asking price is now £26,895, £1,400 less. The latest price cut was seen on 27 October 2026.

Price changes recorded:

• 22 August 2026: £28,295
• 27 August 2026: £27,895
• 8 September 2026: £27,695
• 3 October 2026: £27,500
• 9 October 2026: £27,295
• 27 October 2026: £26,895

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 5 November 2026: valid until 16 December 2026.

It has had 3 MOTs. The latest, on 16 December 2025, passed.

There were no advisories at the latest test.

Mileage at that test: 19,812 miles, which matches the advertised 24,899 miles.

Advertised mileage is about 19,200 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, white. Mileage: 24,000 miles. Price: £26,495, £400 less than this car. Dealer: West Motor Company Kingston in New Malden. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-45cda3c123a3
• 2021 BMW 4 Series M Sport, 2.0 petrol convertible, black. Mileage: 22,399 miles. Price: £27,195, £300 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, £904 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, green, under a mile from this car. Mileage: 41,580 miles. Price: £25,895, £1,000 less than this car. Dealer: Century Cars in Turners Hill. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-8fafe0e55cc8