2020 BMW 4 Series 2.0 420i M Sport

Overview

• Make: BMW
• Model: 4 Series
• Trim: M Sport
• Version: 2.0 420i GPF M Sport Auto RWD Euro 6 (s/s) 2dr (181 bhp)
• Year: 2020
• Mileage: 26,211 miles
• Fuel: Petrol
• Body: Convertible, 2 doors, 4 seats
• Engine: 2.0 litres, 181 bhp
• Gearbox: Automatic
• Drive: Rear-wheel drive
• Colour: Black
• CO2: 143 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

At 26,211 miles, this 2020 BMW 4 Series M Sport has covered about 16,900 fewer miles than other 2020 BMW 4 Series cars. Priced at £20,000, it is advertised £1,648 above the AskCar estimate of £18,352. The AskCar estimate uses UK dealer asking prices, including 1,833 BMW 4 Series adverts, and accounts for the car’s age, mileage and specification. We first recorded this car for sale 15 days ago. The government's MOT record matches its advertised mileage. It is for sale at Car Planet Watford in Rickmansworth. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 5 November 2026.

How we estimate prices and check cars

Price

Above the going rate: £1,648 (8%) over the AskCar estimate of £18,352.

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 1,833 priced BMW 4 Series adverts across different ages and specifications, as of 5 November 2026.

A 2020 BMW 4 Series with the 2.0 petrol engine is typically advertised at £19,400: the median of the 38 for sale on AskCar, as of 5 November 2026.

Time on sale

This 2020 BMW 4 Series has been on sale for at least 15 days.

Price history

AskCar first saw this advert on 21 October 2026 at £20,000. 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 5 November 2026: valid until 28 September 2027.

It has had 4 MOTs. The latest, on 24 September 2026, passed.

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

Mileage at that test: 25,890 miles, which matches the advertised 26,211 miles.

Advertised mileage is about 16,900 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 petrol automatic convertibles are for sale at UK dealers, from £18,499 to £22,490, as of 5 November 2026.

The 2 closest to this car in mileage:

• 2020 BMW 4 Series M Sport, 2.0 petrol convertible, black. Mileage: 36,439 miles. Price: £18,499, £1,501 less than this car. Dealer: Sandles Cars in King's Lynn. AskCar page: https://askcar.co.uk/car/bmw-4-series-2020-dcc661750dec
• 2020 BMW 4 Series M Sport, 2.0 petrol convertible, black. Mileage: 5,000 miles. Price: £22,490, £2,490 more than this car. Dealer: Sk Car Sales . Com in Enfield. AskCar page: https://askcar.co.uk/car/bmw-4-series-2020-da0fa4f6d614