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: 58,093 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

This 2021 BMW 4 Series M Sport has covered 58,093 miles, around 14,000 more miles than is typical for its age. Its asking price of £21,115 is £866 below the AskCar estimate of £21,981. The AskCar estimate uses 1,814 UK dealer adverts for the BMW 4 Series, with adjustments for age, mileage, trim, engine and other specifications. We first saw this car advertised 67 days ago. Its asking price has since fallen by £3,424. Our records show an MOT expiry date of 15 October 2026, which has passed. Ask the dealer for an update. We checked its advertised mileage against the government's MOT record, and they match. The seller is Carbase Bristol, based in Bristol. 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: £866 (3%) under the AskCar estimate of £21,981.

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 67 days.

Price history

AskCar first saw this advert on 29 August 2026 at £24,539. Its asking price is now £21,115, £3,424 less. The latest price cut was seen on 4 November 2026.

Price changes recorded:

• 29 August 2026: £24,539
• 2 September 2026: £23,926
• 4 September 2026: £23,328
• 5 September 2026: £23,038
• 8 September 2026: £22,964
• 9 September 2026: £22,923
• 11 September 2026: £22,838
• 12 September 2026: £22,630
• 15 September 2026: £22,500
• 22 September 2026: £22,210
• 23 September 2026: £22,203
• 26 September 2026: £21,891
• 29 September 2026: £21,872
• 30 September 2026: £21,859
• 1 October 2026: £21,616
• 10 October 2026: £21,569
• 16 October 2026: £21,493
• 20 October 2026: £21,369
• 24 October 2026: £21,341
• 27 October 2026: £21,305
• 28 October 2026: £21,290
• 31 October 2026: £21,175
• 4 November 2026: £21,115

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 4 November 2026: the latest record we hold ran out on 15 October 2026; ask the dealer for the current MOT.

It failed its MOT on 8 October 2025 (offside front shock absorbers has a serious fluid leak) and passed 8 days later, on 16 October 2025.

Advisories at the latest test: offside front jacking point missing; offside front seat belt webbing slightly damaged or frayed.

Mileage at that test: 52,570 miles, which matches the advertised 58,093 miles.

Advertised mileage is about 14,000 miles higher 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, white. Mileage: 58,943 miles. Price: £22,990, £1,875 more than this car. Dealer: Group 1 Southend BMW in Southend-on-Sea. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-088e831a7c9e
• 2021 BMW 4 Series M Sport, 2.0 petrol convertible, black. Mileage: 52,935 miles. Price: £23,990, £2,875 more than this car. Dealer: Williams Bolton Bmw in Bolton. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-183e18236530
• 2021 BMW 4 Series M Sport, 2.0 petrol convertible, black. Mileage: 65,000 miles. Price: £22,988, £1,873 more than this car. Dealer: West Kent Motor Group Online in Sevenoaks. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-dfed66a66f81

• The nearest: 2021 BMW 4 Series M Sport, 2.0 petrol convertible, white, 19 miles from this car. Mileage: 33,607 miles. Price: £24,850, £3,735 more than this car. Dealer: Evans Halshaw Vauxhall Newport in Newport. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-b45f7103a93e