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: 45,000 miles
• Fuel: Diesel, mild hybrid
• Body: Convertible, 2 doors, 4 seats
• Engine: 2.0 litres, 187 bhp
• Gearbox: Automatic
• Drive: Rear-wheel drive
• Colour: Blue
• CO2: 129 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 BMW 4 Series M Sport is advertised with 45,000 miles on the clock. The AskCar estimate for this car is £23,633. It is priced at £22,988, which is £645 below that estimate. The AskCar estimate uses UK dealer asking prices, including 1,821 BMW 4 Series adverts, and accounts for the car’s age, mileage and specification. We first recorded this car for sale today. The government's MOT record matches its advertised mileage. It is advertised by Junction 17 Cars Peterborough in Yaxley. 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: £645 (2%) under the AskCar estimate of £23,633.

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 £22,988. 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 1 September 2027.

It has had 3 MOTs. The latest, on 24 August 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 45,014 miles, which matches the advertised 45,000 miles.

Advertised mileage is about 900 miles higher 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: 41,650 miles. Price: £23,599, £611 more than this car. Dealer: Fords Of Winsford Car Supermarket in Winsford. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-b356ce1f181f
• 2021 BMW 4 Series M Sport, 2.0 diesel convertible, blue. Mileage: 38,735 miles. Price: £22,300, £688 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: 52,500 miles. Price: £21,999, £989 less than this car. Dealer: Lonsdale Vehicle Sales Direct in Cardiff. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-21f51da480af

• The nearest: 2021 BMW 4 Series M Sport, 2.0 diesel convertible, blue, 61 miles from this car. Mileage: 9,654 miles. Price: £28,745, £5,757 more than this car. Dealer: Group 1 Borehamwood BMW in Borehamwood. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-ae16c0438fca