2020 BMW 4 Series 2.0 420d M Sport

Overview

• Make: BMW
• Model: 4 Series
• Trim: M Sport
• Version: 2.0 420d M Sport Auto RWD Euro 6 (s/s) 2dr (187 bhp)
• Year: 2020
• Mileage: 30,335 miles
• Fuel: Diesel
• Body: Convertible, 2 doors, 4 seats
• Engine: 2.0 litres, 187 bhp
• Gearbox: Automatic
• Drive: Rear-wheel drive
• Colour: Black
• CO2: 124 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

With 30,335 miles on the clock, this 2020 BMW 4 Series M Sport has done roughly 13,100 fewer miles than a typical 2020 BMW 4 Series. Priced at £17,720, it is advertised £1,710 below the AskCar estimate of £19,430. To work out the AskCar estimate, we analyse UK dealer adverts for 1,816 BMW 4 Series cars across different ages and specifications. The dealer may accept less: this car has been on sale for at least 164 days, and its asking price has been cut by £2,175. We checked its advertised mileage against the government's MOT record, and they match. The seller is Essex Car Company, based in Rainham. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 8 November 2026.

How we estimate prices and check cars

Price

Good value: £1,710 (8%) under the AskCar estimate of £19,430.

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 1,816 priced BMW 4 Series adverts across different ages and specifications, as of 8 November 2026.

A 2020 BMW 4 Series with the 2.0 diesel engine is typically advertised at £19,600: the median of the 39 for sale on AskCar, as of 8 November 2026.

Time on sale

The dealer may accept less. This 2020 BMW 4 Series has been on sale for at least 164 days, and its asking price has been cut by £2,175. About 6 in 10 of 2020 BMW 4 Series cars are gone from sale within a month of being advertised: 44 of the 80 first advertised between 10 July 2026 and 5 October 2026.

Price history

AskCar first saw this advert on 28 May 2026 at £19,895. Its asking price is now £17,720, £2,175 less. The latest price cut was seen on 5 November 2026.

Price changes recorded:

• 29 May 2026: £19,895
• 8 June 2026: £19,995
• 10 August 2026: £19,400
• 21 August 2026: £18,999
• 25 August 2026: £18,489
• 27 August 2026: £18,795
• 8 September 2026: £18,297
• 5 November 2026: £17,720

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 8 November 2026: valid until 3 March 2027.

It has had 4 MOTs. The latest, on 4 March 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 30,384 miles, which matches the advertised 30,335 miles.

Advertised mileage is about 13,100 miles lower than the median mileage of a 2020 BMW 4 Series on AskCar.

Similar cars

2 other 2020 BMW 4 Series M Sport 2.0 diesel automatic convertibles are for sale at UK dealers, from £19,488 to £19,990, as of 8 November 2026.

The 2 closest to this car in mileage:

• 2020 BMW 4 Series M Sport, 2.0 diesel convertible, white. Mileage: 27,700 miles. Price: £19,990, £2,270 more than this car. Dealer: Flc in Yiewsley. AskCar page: https://askcar.co.uk/car/bmw-4-series-2020-ad465198ff36
• 2020 BMW 4 Series M Sport, 2.0 diesel convertible, white. Mileage: 35,941 miles. Price: £19,488, £1,768 more than this car. Dealer: Vines of Redhill BMW in Redhill. AskCar page: https://askcar.co.uk/car/bmw-4-series-2020-87b2c413beb9