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: 34,868 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

At 34,868 miles, this 2021 BMW 4 Series M Sport has covered about 9,200 fewer miles than other 2021 BMW 4 Series cars. The AskCar estimate for this car is £25,225. It is priced at £22,795, which is £2,430 below that estimate. The AskCar estimate uses UK dealer asking prices, including 1,814 BMW 4 Series adverts, and accounts for the car’s age, mileage and specification. We first saw this car advertised 116 days ago. Its asking price has since fallen by £5,195. According to the government's MOT record, its advertised mileage is consistent with the latest test. The seller is Williams Bmw Rochdale, based in Rochdale. 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

Good value: £2,430 (9%) under the AskCar estimate of £25,225.

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

This 2021 BMW 4 Series has been on sale for at least 116 days.

Price history

AskCar first saw this advert on 11 July 2026 at £27,990. Its asking price is now £22,795, £5,195 less. The latest price cut was seen on 31 October 2026.

Price changes recorded:

• 11 July 2026: £27,990
• 22 July 2026: £27,590
• 19 August 2026: £26,990
• 10 September 2026: £26,790
• 17 September 2026: £25,990
• 6 October 2026: £24,990
• 21 October 2026: £24,890
• 27 October 2026: £23,990
• 31 October 2026: £22,795

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 4 November 2026: valid until 22 December 2026.

It has had 3 MOTs. The latest, on 23 December 2025, passed.

There were no advisories at the latest test.

Mileage at that test: 30,367 miles, which matches the advertised 34,868 miles.

Advertised mileage is about 9,200 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 £28,745, as of 4 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: £22,600, £195 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, £1,005 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, black. Mileage: 49,000 miles. Price: £23,250, £455 more than this car. Dealer: Family Autos Sports and Prestige in Brigg. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-9794d26f8203