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: 33,951 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 33,951 miles, around 5,600 more miles than is typical for its age. The dealer is asking £26,101, which is £2,699 below the AskCar estimate of £28,800. To work out the AskCar estimate, we analyse UK dealer adverts for 1,814 BMW 4 Series cars across different ages and specifications. We first saw this car advertised 101 days ago. Its asking price has since fallen by £3,034. The government's MOT record matches its advertised mileage. It is advertised by Carsa Towcester in West Northamptonshire. 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: £2,699 (9%) under the AskCar estimate of £28,800.

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 101 days.

Price history

AskCar first saw this advert on 26 July 2026 at £29,135. Its asking price is now £26,101, £3,034 less. The latest price cut was seen on 3 November 2026.

Price changes recorded:

• 26 July 2026: £29,135
• 28 July 2026: £29,133
• 29 July 2026: £29,135
• 3 August 2026: £29,181
• 5 August 2026: £29,104
• 6 August 2026: £29,108
• 7 August 2026: £29,060
• 9 August 2026: £29,036
• 10 August 2026: £28,712
• 11 August 2026: £28,876
• 12 August 2026: £28,895
• 13 August 2026: £28,874
• 14 August 2026: £28,921
• 15 August 2026: £29,000
• 16 August 2026: £28,897
• 18 August 2026: £28,893
• 19 August 2026: £28,921
• 20 August 2026: £28,865
• 21 August 2026: £28,811
• 22 August 2026: £28,785
• 23 August 2026: £28,772
• 24 August 2026: £28,740
• 25 August 2026: £28,706
• 26 August 2026: £28,784
• 27 August 2026: £28,737
• 28 August 2026: £28,749
• 29 August 2026: £28,649
• 30 August 2026: £28,685
• 8 September 2026: £28,452
• 15 September 2026: £28,102
• 30 September 2026: £27,445
• 6 October 2026: £27,646
• 11 October 2026: £27,410
• 16 October 2026: £27,120
• 23 October 2026: £26,693
• 26 October 2026: £26,518
• 31 October 2026: £26,335
• 3 November 2026: £26,101

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 4 November 2026: valid until 10 March 2027.

It failed its MOT on 9 March 2026 (nearside rear outer tyre has a bulge, caused by separation or partial failure of its structure) and passed 2 days later, on 11 March 2026.

There were no advisories at the latest test.

Mileage at that test: 30,098 miles, which matches the advertised 33,951 miles.

Advertised mileage is about 5,600 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 £26,500 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, grey. Mileage: 33,845 miles. Price: £30,990, £4,889 more than this car. Dealer: Stratstone Bmw Doncaster in Doncaster. AskCar page: https://askcar.co.uk/car/bmw-4-series-2023-eb92975469b2
• 2023 BMW 4 Series M Sport, 2.0 petrol convertible, grey. Mileage: 32,611 miles. Price: £30,750, £4,649 more than this car. Dealer: Sytner Coventry BMW in Coventry. AskCar page: https://askcar.co.uk/car/bmw-4-series-2023-9640c3b9c591
• 2023 BMW 4 Series M Sport, 2.0 petrol convertible, black. Mileage: 31,628 miles. Price: £29,600, £3,499 more than this car. Dealer: Vines of Guildford BMW in Guildford. AskCar page: https://askcar.co.uk/car/bmw-4-series-2023-104990cd2204

• The nearest: 2023 BMW 4 Series M Sport, 2.0 petrol convertible, blue, 25 miles from this car. Mileage: 50,186 miles. Price: £28,193, £2,092 more than this car. Dealer: Group 1 Bedford BMW in Bedford. AskCar page: https://askcar.co.uk/car/bmw-4-series-2023-1a676fdd5448