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 2dr (187 bhp)
• Year: 2021
• Mileage: 9,654 miles
• Fuel: Diesel, mild hybrid
• Body: Convertible, 2 doors, 4 seats
• Engine: 2.0 litres, 187 bhp
• Gearbox: Automatic
• Drive: Rear-wheel drive
• Colour: Blue
• CO2: 129 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

With 9,654 miles on the clock, this 2021 BMW 4 Series M Sport has done roughly 34,500 fewer miles than a typical 2021 BMW 4 Series. The dealer is asking £28,745, which is £317 above the AskCar estimate of £28,428. To work out the AskCar estimate, we analyse UK dealer adverts for 1,814 BMW 4 Series cars across different ages and specifications. It first appeared in our advert records today. We checked its advertised mileage against the government's MOT record, and they match. The seller is Group 1 Borehamwood BMW, based in Borehamwood. 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: £317 (1%) over the AskCar estimate of £28,428.

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 diesel engine is typically advertised at £24,000: the median of the 144 for sale on AskCar, as of 4 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: 103 of the 239 first advertised between 11 July 2026 and 1 October 2026.

Price history

AskCar first saw this advert on 4 November 2026 at £28,745. 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 4 November 2026: valid until 1 November 2027.

It failed its MOT on 2 November 2026 (nearside rear tyre has a cut in excess of the requirements deep enough to reach the ply or cords middle) and passed later the same day.

Advisories at the latest test: offside rear outer tyre has a cut but not deep enough to reach the ply or cords; offside front outer tyre slightly damaged/cracking or perishing.

Mileage at that test: 9,648 miles, which matches the advertised 9,654 miles.

Advertised mileage is about 34,500 miles lower than the median mileage of a 2021 BMW 4 Series on AskCar.

Similar cars

5 other 2021 BMW 4 Series M Sport 2.0 diesel automatic convertibles are for sale at UK dealers, from £21,999 to £23,800, as of 4 November 2026.

The 3 closest to this car in mileage:

• 2021 BMW 4 Series M Sport, 2.0 diesel convertible, white. Mileage: 34,868 miles. Price: £22,795, £5,950 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: 38,735 miles. Price: £22,600, £6,145 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, blue. Mileage: 44,855 miles. Price: £23,800, £4,945 less than this car. Dealer: Berry Heathrow in Heathrow. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-cbc9d8c6c160