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 (s/s) 2dr (181 bhp)
• Year: 2021
• Mileage: 12,820 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 2021 BMW 4 Series M Sport is advertised with 12,820 miles, approximately 31,200 below the typical mileage for its age. The AskCar estimate for this car is £27,658. It is priced at £27,691, which is £33 above that estimate. The AskCar estimate draws on 1,826 BMW 4 Series adverts across the UK, adjusting for age, mileage, trim, engine and other specifications. We first recorded this advert 130 days ago, and its asking price has since fallen by £1,961. Its advertised mileage matches the government's MOT record. The seller is Hedin Automotive Enfield BMW, based in Enfield. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 6 November 2026.

How we estimate prices and check cars

Price

Fair price: £33 (under 1%) over the AskCar estimate of £27,658.

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 1,826 priced BMW 4 Series adverts across different ages and specifications, as of 6 November 2026.

A 2021 BMW 4 Series with the 2.0 petrol engine is typically advertised at £23,800: the median of the 148 for sale on AskCar, as of 6 November 2026.

Time on sale

This 2021 BMW 4 Series has been on sale for at least 130 days.

Price history

AskCar first saw this advert on 29 June 2026 at £29,652. Its asking price is now £27,691, £1,961 less. The latest price cut was seen on 28 October 2026.

Price changes recorded:

• 29 June 2026: £29,652
• 17 July 2026: £29,500
• 29 July 2026: £29,158
• 31 July 2026: £29,428
• 3 August 2026: £29,375
• 5 August 2026: £29,425
• 13 August 2026: £29,372
• 18 August 2026: £29,090
• 20 August 2026: £28,775
• 25 August 2026: £28,840
• 27 August 2026: £28,773
• 28 August 2026: £28,686
• 1 September 2026: £28,296
• 4 September 2026: £28,362
• 15 September 2026: £27,900
• 24 September 2026: £27,750
• 2 October 2026: £27,800
• 8 October 2026: £27,500
• 15 October 2026: £27,200
• 28 October 2026: £27,000
• 6 November 2026: £27,691

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 6 November 2026: valid until 27 January 2027.

It has had 3 MOTs. The latest, on 28 January 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 11,763 miles, which matches the advertised 12,820 miles.

Advertised mileage is about 31,200 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 6 November 2026.

The 3 closest to this car in mileage:

• 2021 BMW 4 Series M Sport, 2.0 petrol convertible, green. Mileage: 12,250 miles. Price: £33,950, £6,259 more than this car. Dealer: Kams Cars in Borehamwood. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-aea4aa4c4d93
• 2021 BMW 4 Series M Sport, 2.0 petrol convertible, grey. Mileage: 17,141 miles. Price: £29,300, £1,609 more than this car. Dealer: Vertu BMW Exeter in Exeter. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-d184ad7440ea
• 2021 BMW 4 Series M Sport, 2.0 petrol convertible, black. Mileage: 22,399 miles. Price: £27,195, £496 less than this car. Dealer: John Clark BMW Tayside in Dundee. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-9751e81829b1