2023 BMW 4 Series 2.0 420i M Sport

Overview

• Make: BMW
• Model: 4 Series
• Trim: M Sport
• Version: 2.0 420i M Sport Auto RWD Euro 6 (s/s) 2dr (181 bhp)
• Year: 2023
• Mileage: 28,614 miles
• Fuel: Petrol
• Body: Convertible, 2 doors, 4 seats
• Engine: 2.0 litres, 181 bhp
• Gearbox: Automatic
• Drive: Rear-wheel drive
• Colour: White
• CO2: 160 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2023 BMW 4 Series M Sport has covered 28,614 miles. Its asking price of £29,550 is £72 below the AskCar estimate of £29,622. The AskCar estimate draws on 1,814 BMW 4 Series adverts across the UK, adjusting for age, mileage, trim, engine and other specifications. We first saw this car advertised 40 days ago. Its asking price has since fallen by £1,500. 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 4 November 2026.

How we estimate prices and check cars

Price

Fair price: £72 (under 1%) under the AskCar estimate of £29,622.

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 2023 BMW 4 Series with the 2.0 petrol engine is typically advertised at £29,900: the median of the 90 for sale on AskCar, as of 4 November 2026.

Time on sale

This 2023 BMW 4 Series has been on sale for at least 40 days.

Price history

AskCar first saw this advert on 25 September 2026 at £31,050. Its asking price is now £29,550, £1,500 less. The latest price cut was seen on 30 October 2026.

Price changes recorded:

• 25 September 2026: £31,050
• 30 September 2026: £30,750
• 11 October 2026: £30,450
• 17 October 2026: £30,150
• 23 October 2026: £29,850
• 30 October 2026: £29,550

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 4 November 2026: valid until 30 January 2027.

It has had one MOT, on 13 January 2026, and passed.

There were no advisories at the latest test.

Mileage at that test: 24,719 miles, which matches the advertised 28,614 miles.

Advertised mileage is about 300 miles higher than the median mileage of a 2023 BMW 4 Series on AskCar.

Similar cars

34 other 2023 BMW 4 Series M Sport 2.0 petrol automatic convertibles are for sale at UK dealers, from £26,101 to £33,990, as of 4 November 2026.

The 3 closest to this car in mileage:

• 2023 BMW 4 Series M Sport, 2.0 petrol convertible, blue. Mileage: 28,500 miles. Price: £29,994, £444 more than this car. Dealer: Wimbledon Carriage Company in East Horsley. AskCar page: https://askcar.co.uk/car/bmw-4-series-2023-fd28059334ac
• 2023 BMW 4 Series M Sport, 2.0 petrol convertible, black. Mileage: 28,887 miles. Price: £31,895, £2,345 more than this car. Dealer: Berry Croydon BMW in Croydon. AskCar page: https://askcar.co.uk/car/bmw-4-series-2023-fad147ee2df2
• 2023 BMW 4 Series M Sport, 2.0 petrol convertible, blue. Mileage: 29,231 miles. Price: £30,000, £450 more than this car. Dealer: MB Brent Park in London. AskCar page: https://askcar.co.uk/car/bmw-4-series-2023-75c34cb72b20

• The nearest: 2023 BMW 4 Series M Sport, 2.0 petrol convertible, blue, 10 miles from this car. Mileage: 24,139 miles. Price: £33,000, £3,450 more than this car. Dealer: Berry Heathrow in Heathrow. AskCar page: https://askcar.co.uk/car/bmw-4-series-2023-13b439dfa6d6