2021 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 2dr Step (181 bhp)
• Year: 2021
• Mileage: 33,607 miles
• Fuel: Petrol
• Body: Convertible, 2 doors, 4 seats
• Engine: 2.0 litres, 181 bhp
• Gearbox: Automatic
• Drive: Rear-wheel drive
• Colour: White
• CO2: 154 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 BMW 4 Series M Sport has covered 33,607 miles, around 10,500 fewer miles than is typical for its age. The AskCar estimate for this car is £25,048. It is priced at £24,850, which is £198 below that estimate. 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 54 days ago. Its asking price has since fallen by £1,424. According to the government's MOT record, its advertised mileage is consistent with the latest test. The seller is Evans Halshaw Vauxhall Newport, based in Newport. 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: £198 (under 1%) under the AskCar estimate of £25,048.

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 2021 BMW 4 Series with the 2.0 petrol engine is typically advertised at £24,000: the median of the 144 for sale on AskCar, as of 4 November 2026.

Time on sale

This 2021 BMW 4 Series has been on sale for at least 54 days.

Price history

AskCar first saw this advert on 11 September 2026 at £26,274. Its asking price is now £24,850, £1,424 less. The latest price cut was seen on 24 October 2026.

Price changes recorded:

• 11 September 2026: £26,274
• 12 September 2026: £25,980
• 29 September 2026: £25,920
• 2 October 2026: £25,730
• 7 October 2026: £25,250
• 13 October 2026: £24,870
• 24 October 2026: £24,850

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 4 November 2026: valid until 27 November 2026.

It has had 3 MOTs. The latest, on 13 November 2025, passed.

There were no advisories at the latest test.

Mileage at that test: 26,928 miles, which matches the advertised 33,607 miles.

Advertised mileage is about 10,500 miles lower than the median mileage of a 2021 BMW 4 Series on AskCar.

Similar cars

26 other 2021 BMW 4 Series M Sport 2.0 petrol automatic convertibles are for sale at UK dealers, from £18,990 to £33,950, as of 4 November 2026.

The 3 closest to this car in mileage:

• 2021 BMW 4 Series M Sport, 2.0 petrol convertible, white. Mileage: 33,078 miles. Price: £27,750, £2,900 more than this car. Dealer: Vines of Guildford BMW in Guildford. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-e16967b0feee
• 2021 BMW 4 Series M Sport, 2.0 petrol convertible, green. Mileage: 33,000 miles. Price: £25,990, £1,140 more than this car. Dealer: Northover Cars in Whitstable. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-73ad6e80af4f
• 2021 BMW 4 Series M Sport, 2.0 petrol convertible, white. Mileage: 35,008 miles. Price: £25,990, £1,140 more than this car. Dealer: Alpha Motors in Wigan. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-dfd9ebfe4c58

• The nearest: 2021 BMW 4 Series M Sport, 2.0 petrol convertible, white, 19 miles from this car. Mileage: 58,093 miles. Price: £21,115, £3,735 less than this car. Dealer: Carbase Bristol in Bristol. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-52eb4cdc01ce