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: 52,500 miles
• Fuel: Diesel, mild hybrid
• Body: Convertible, 2 doors, 4 seats
• Engine: 2.0 litres, 187 bhp
• Gearbox: Automatic
• Drive: Rear-wheel drive
• Colour: Blue
• CO2: 129 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 BMW 4 Series M Sport has covered 52,500 miles, around 8,400 more miles than is typical for its age. The AskCar estimate for this car is £22,788. It is priced at £21,999, which is £789 below that estimate. To work out the AskCar estimate, we analyse UK dealer adverts for 1,826 BMW 4 Series cars across different ages and specifications. We first saw this car advertised 56 days ago. Its asking price has since fallen by £4,996. The government's MOT record matches its advertised mileage. It is for sale at Lonsdale Vehicle Sales Direct in Caerphilly. 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: £789 (3%) under the AskCar estimate of £22,788.

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 56 days.

Price history

AskCar first saw this advert on 11 September 2026 at £26,995. Its asking price is now £21,999, £4,996 less. The latest price cut was seen on 10 October 2026.

Price changes recorded:

• 11 September 2026: £26,995
• 16 September 2026: £23,995
• 22 September 2026: £22,995
• 7 October 2026: £22,695
• 10 October 2026: £21,999

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 6 November 2026: valid until 26 January 2027.

It has had 3 MOTs. The latest, on 27 January 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 51,905 miles, which matches the advertised 52,500 miles.

Advertised mileage is about 8,400 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 £22,600 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, black. Mileage: 49,000 miles. Price: £23,250, £1,251 more than this car. Dealer: Family Autos Sports and Prestige in Brigg. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-9794d26f8203
• 2021 BMW 4 Series M Sport, 2.0 diesel convertible, blue. Mileage: 44,855 miles. Price: £23,800, £1,801 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, £1,600 more than this car. Dealer: Fords Of Winsford Car Supermarket in Winsford. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-b356ce1f181f