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: 22,399 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

This 2021 BMW 4 Series M Sport is advertised with 22,399 miles, approximately 21,700 below the typical mileage for its age. The AskCar estimate for this car is £26,494. It is priced at £27,195, which is £701 above that estimate. The AskCar estimate draws on 1,826 BMW 4 Series adverts across the UK, adjusting for age, mileage, trim, engine and other specifications. We first saw this car advertised 85 days ago. Its asking price has since fallen by £1,805. According to the government's MOT record, its advertised mileage is consistent with the latest test. It is advertised by John Clark BMW Tayside in Dundee. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 6 November 2026.

How we estimate prices and check cars

Price

Fair price: £701 (2%) over the AskCar estimate of £26,494.

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 1,826 priced BMW 4 Series adverts across different ages and specifications, as of 6 November 2026.

A 2021 BMW 4 Series with the 2.0 petrol engine is typically advertised at £23,800: the median of the 148 for sale on AskCar, as of 6 November 2026.

Time on sale

This 2021 BMW 4 Series has been on sale for at least 85 days.

Price history

AskCar first saw this advert on 13 August 2026 at £29,000. Its asking price is now £27,195, £1,805 less. The latest price cut was seen on 14 October 2026.

Price changes recorded:

• 13 August 2026: £29,000
• 24 September 2026: £27,995
• 14 October 2026: £27,195

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 6 November 2026: valid until 12 August 2027.

It has had 3 MOTs. The latest, on 6 August 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 22,295 miles, which matches the advertised 22,399 miles.

Advertised mileage is about 21,700 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 6 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, £700 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, blue. Mileage: 24,899 miles. Price: £26,895, £300 less 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, grey. Mileage: 17,141 miles. Price: £29,300, £2,105 more than this car. Dealer: Vertu BMW Exeter in Exeter. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-d184ad7440ea

• The nearest: 2021 BMW 4 Series M Sport, 2.0 petrol convertible, black, 45 miles from this car. Mileage: 72,748 miles. Price: £20,999, £6,196 less than this car. Dealer: Pro-Division Car Sales in Stirling. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-7396e5991916