2021 BMW 4 Series 2.0 420d MHT M Sport

Overview

• Make: BMW
• Model: 4 Series
• Trim: M Sport
• Version: 2.0 420d MHT M Sport Auto RWD Euro 6 (s/s) 2dr (187 bhp)
• Year: 2021
• Mileage: 49,000 miles
• Fuel: Diesel, mild hybrid
• Body: Convertible, 2 doors, 4 seats
• Engine: 2.0 litres, 187 bhp
• Gearbox: Automatic
• Drive: Rear-wheel drive
• Colour: Black
• CO2: 129 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

At 49,000 miles, this 2021 BMW 4 Series M Sport has covered about 4,900 more miles than other 2021 BMW 4 Series cars. The dealer is asking £23,250, which is £351 below the AskCar estimate of £23,601. To work out the AskCar estimate, we analyse UK dealer adverts for 1,826 BMW 4 Series cars across different ages and specifications. This car was first seen in our listings data 10 days ago. Its advertised mileage matches the government's MOT record. You can find this car at Family Autos Sports and Prestige in Lincolnshire. 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: £351 (1%) under the AskCar estimate of £23,601.

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 diesel 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 10 days.

Price history

AskCar first saw this advert on 27 October 2026 at £23,250. Its asking price has not changed.

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 6 November 2026: valid until 22 September 2027.

It has had 3 MOTs. The latest, on 21 September 2026, passed.

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

Mileage at that test: 47,464 miles, which matches the advertised 49,000 miles.

Advertised mileage is about 4,900 miles higher than the median mileage of a 2021 BMW 4 Series on AskCar.

Similar cars

6 other 2021 BMW 4 Series M Sport 2.0 diesel automatic convertibles are for sale at UK dealers, from £21,999 to £28,745, as of 6 November 2026.

The 3 closest to this car in mileage:

• 2021 BMW 4 Series M Sport, 2.0 diesel convertible, blue. Mileage: 52,500 miles. Price: £21,999, £1,251 less than this car. Dealer: Lonsdale Vehicle Sales Direct in Cardiff. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-21f51da480af
• 2021 BMW 4 Series M Sport, 2.0 diesel convertible, blue. Mileage: 44,855 miles. Price: £23,800, £550 more than this car. Dealer: Berry Heathrow in Heathrow. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-cbc9d8c6c160
• 2021 BMW 4 Series M Sport, 2.0 diesel convertible, blue. Mileage: 41,650 miles. Price: £23,599, £349 more than this car. Dealer: Fords Of Winsford Car Supermarket in Winsford. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-b356ce1f181f

• The nearest: 2021 BMW 4 Series M Sport, 2.0 diesel convertible, white, 69 miles from this car. Mileage: 34,868 miles. Price: £22,795, £455 less than this car. Dealer: Williams Bmw Rochdale in Rochdale. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-d1c51114b60d