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: 27,913 miles
• Fuel: Petrol
• Body: Convertible, 2 doors, 4 seats
• Engine: 2.0 litres, 181 bhp
• Gearbox: Automatic
• Drive: Rear-wheel drive
• Colour: Grey
• CO2: 160 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2023 BMW 4 Series M Sport has covered 27,913 miles. The dealer is asking £29,545, which is £170 below the AskCar estimate of £29,715. To work out the AskCar estimate, we analyse UK dealer adverts for 1,814 BMW 4 Series cars across different ages and specifications. This car was first seen in our listings data 1 day ago. According to the government's MOT record, its advertised mileage is consistent with the latest test. The seller is Group 1 Reading BMW, based in Reading. 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: £170 (under 1%) under the AskCar estimate of £29,715.

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

AskCar first saw this 2023 BMW 4 Series advertised 1 day ago. About 4 in 10 of 2023 BMW 4 Series cars are gone from sale within a month of being advertised: 79 of the 180 first advertised between 11 July 2026 and 1 October 2026.

Price history

AskCar first saw this advert on 3 November 2026 at £29,545. 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 4 November 2026: valid until 20 January 2027.

It has had one MOT, on 23 December 2025, and passed.

Advisories at the latest test: nearside front outer tyre has a cut but not deep enough to reach the ply or cords sidewall.

Mileage at that test: 20,329 miles, which matches the advertised 27,913 miles.

Advertised mileage is about 400 miles lower 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: 27,903 miles. Price: £29,990, £445 more than this car. Dealer: Barretts BMW Ashford in Ashford. AskCar page: https://askcar.co.uk/car/bmw-4-series-2023-c60bf2f8b37d
• 2023 BMW 4 Series M Sport, 2.0 petrol convertible, blue. Mileage: 27,952 miles. Price: £29,995, £450 more than this car. Dealer: Barretts BMW Ashford in Ashford. AskCar page: https://askcar.co.uk/car/bmw-4-series-2023-a71af739daae
• 2023 BMW 4 Series M Sport, 2.0 petrol convertible, blue. Mileage: 28,500 miles. Price: £29,994, £449 more than this car. Dealer: Wimbledon Carriage Company in East Horsley. AskCar page: https://askcar.co.uk/car/bmw-4-series-2023-fd28059334ac

• The nearest: 2023 BMW 4 Series M Sport, 2.0 petrol convertible, black, 21 miles from this car. Mileage: 31,628 miles. Price: £29,600, £55 more than this car. Dealer: Vines of Guildford BMW in Guildford. AskCar page: https://askcar.co.uk/car/bmw-4-series-2023-104990cd2204