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 2dr (181 bhp)
• Year: 2021
• Mileage: 35,008 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

With 35,008 miles on the clock, this 2021 BMW 4 Series M Sport has done roughly 9,100 fewer miles than a typical 2021 BMW 4 Series. The AskCar estimate for this car is £25,016. It is priced at £25,990, which is £974 above that estimate. To work out the AskCar estimate, we analyse UK dealer adverts for 1,814 BMW 4 Series cars across different ages and specifications. We first saw this car advertised 81 days ago. Its asking price has since fallen by £2,000. According to the government's MOT record, its advertised mileage is consistent with the latest test. It is for sale at Alpha Motors in Wigan. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 4 November 2026.

How we estimate prices and check cars

Price

Fair price: £974 (3%) over the AskCar estimate of £25,016.

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 1,814 priced BMW 4 Series adverts across different ages and specifications, as of 4 November 2026.

A 2021 BMW 4 Series with the 2.0 petrol engine is typically advertised at £24,000: the median of the 144 for sale on AskCar, as of 4 November 2026.

Time on sale

This 2021 BMW 4 Series has been on sale for at least 81 days.

Price history

AskCar first saw this advert on 15 August 2026 at £27,990. Its asking price is now £25,990, £2,000 less. The latest price cut was seen on 15 October 2026.

Price changes recorded:

• 15 August 2026: £27,990
• 13 September 2026: £26,990
• 15 October 2026: £25,990

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 4 November 2026: valid until 21 May 2027.

It failed its MOT on 21 May 2026 (front registration plate does not conform to the specified requirements; rear registration plate does not conform to the specified requirements) and passed 1 day later, on 22 May 2026.

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

Mileage at that test: 34,172 miles, which matches the advertised 35,008 miles.

Advertised mileage is about 9,100 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 4 November 2026.

The 3 closest to this car in mileage:

• 2021 BMW 4 Series M Sport, 2.0 petrol convertible, blue. Mileage: 36,115 miles. Price: £26,750, £760 more than this car. Dealer: Sytner Luton BMW in Luton. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-4689bf59ccf8
• 2021 BMW 4 Series M Sport, 2.0 petrol convertible, white. Mileage: 33,607 miles. Price: £24,850, £1,140 less than this car. Dealer: Evans Halshaw Vauxhall Newport in Newport. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-b45f7103a93e
• 2021 BMW 4 Series M Sport, 2.0 petrol convertible, white. Mileage: 33,078 miles. Price: £27,750, £1,760 more than this car. Dealer: Vines of Guildford BMW in Guildford. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-e16967b0feee

• The nearest: 2021 BMW 4 Series M Sport, 2.0 petrol convertible, black, 10 miles from this car. Mileage: 52,935 miles. Price: £23,990, £2,000 less than this car. Dealer: Williams Bolton Bmw in Bolton. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-183e18236530