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: 72,748 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

At 72,748 miles, this 2021 BMW 4 Series M Sport has covered about 28,700 more miles than other 2021 BMW 4 Series cars. The AskCar estimate for this car is £19,734. It is priced at £20,999, which is £1,265 above that estimate. The AskCar estimate uses 1,826 UK dealer adverts for the BMW 4 Series, with adjustments for age, mileage, trim, engine and other specifications. We first saw this car advertised 48 days ago. Its asking price has since fallen by £501. We checked its advertised mileage against the government's MOT record, and they match. You can find this car at Pro-Division Car Sales in Larbert. 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: £1,265 (6%) over the AskCar estimate of £19,734.

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 48 days.

Price history

AskCar first saw this advert on 19 September 2026 at £21,500. Its asking price is now £20,999, £501 less. The latest price cut was seen on 15 October 2026.

Price changes recorded:

• 19 September 2026: £21,500
• 15 October 2026: £20,999

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 6 November 2026: valid until 30 May 2027.

It has had 4 MOTs. The latest, on 13 May 2026, passed.

Advisories at the latest test: nearside front shock absorbers has light misting of oil; offside front shock absorbers has light misting of oil.

Mileage at that test: 69,953 miles, which matches the advertised 72,748 miles.

Advertised mileage is about 28,700 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 6 November 2026.

The 3 closest to this car in mileage:

• 2021 BMW 4 Series M Sport, 2.0 petrol convertible, black. Mileage: 68,323 miles. Price: £21,000, the same price as this car. Dealer: Grange. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-1bfff9575fa2
• 2021 BMW 4 Series M Sport, 2.0 petrol convertible, black. Mileage: 65,000 miles. Price: £22,988, £1,989 more than this car. Dealer: West Kent Motor Group Online in Sevenoaks. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-dfed66a66f81
• 2021 BMW 4 Series M Sport, 2.0 petrol convertible, white. Mileage: 58,943 miles. Price: £22,990, £1,991 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

• The nearest: 2021 BMW 4 Series M Sport, 2.0 petrol convertible, black, 45 miles from this car. Mileage: 22,399 miles. Price: £27,195, £6,196 more than this car. Dealer: John Clark BMW Tayside in Dundee. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-9751e81829b1