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: 37,500 miles
• Fuel: Diesel, mild hybrid
• Body: Convertible, 2 doors, 4 seats
• Engine: 2.0 litres, 187 bhp
• Gearbox: Automatic
• Drive: Rear-wheel drive
• Colour: White
• CO2: 129 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 BMW 4 Series M Sport has covered 37,500 miles, around 6,600 fewer miles than is typical for its age. The dealer is asking £23,600, which is £1,048 below the AskCar estimate of £24,648. To work out the AskCar estimate, we analyse UK dealer adverts for 1,821 BMW 4 Series cars across different ages and specifications. This car was first seen in our listings data today. According to the government's MOT record, its advertised mileage is consistent with the latest test. It is advertised by Colin Ludwell Cars in Bristol. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 11 November 2026.

How we estimate prices and check cars

Price

Fair price: £1,048 (4%) under the AskCar estimate of £24,648.

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 1,821 priced BMW 4 Series adverts across different ages and specifications, as of 11 November 2026.

A 2021 BMW 4 Series with the 2.0 diesel engine is typically advertised at £23,900: the median of the 148 for sale on AskCar, as of 11 November 2026.

Time on sale

AskCar first saw this 2021 BMW 4 Series advertised today. About 4 in 10 of 2021 BMW 4 Series cars are gone from sale within a month of being advertised: 115 of the 272 first advertised between 11 July 2026 and 8 October 2026.

Price history

AskCar first saw this advert on 11 November 2026 at £23,600. 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 11 November 2026: valid until 10 February 2027.

It has had 3 MOTs. The latest, on 30 January 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 33,003 miles, which matches the advertised 37,500 miles.

Advertised mileage is about 6,600 miles lower than the median mileage of a 2021 BMW 4 Series on AskCar.

Similar cars

7 other 2021 BMW 4 Series M Sport 2.0 diesel automatic convertibles are for sale at UK dealers, from £21,990 to £28,745, as of 11 November 2026.

The 3 closest to this car in mileage:

• 2021 BMW 4 Series M Sport, 2.0 diesel convertible, blue. Mileage: 38,735 miles. Price: £22,300, £1,300 less than this car. Dealer: Car Planet Barnet in Barnet. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-146d187a836c
• 2021 BMW 4 Series M Sport, 2.0 diesel convertible, white. Mileage: 34,868 miles. Price: £22,795, £805 less than this car. Dealer: Williams Bmw Rochdale in Rochdale. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-d1c51114b60d
• 2021 BMW 4 Series M Sport, 2.0 diesel convertible, blue. Mileage: 41,650 miles. Price: £23,599, the same price as 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, blue, 29 miles from this car. Mileage: 52,500 miles. Price: £21,999, £1,601 less than this car. Dealer: Lonsdale Vehicle Sales Direct in Cardiff. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-21f51da480af