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: 17,141 miles
• Fuel: Petrol
• Body: Convertible, 2 doors, 4 seats
• Engine: 2.0 litres, 181 bhp
• Gearbox: Automatic
• Drive: Rear-wheel drive
• Colour: Grey
• CO2: 154 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 BMW 4 Series M Sport has covered 17,141 miles, around 26,900 fewer miles than is typical for its age. Priced at £29,300, it is advertised £2,363 above the AskCar estimate of £26,937. The AskCar estimate draws on 1,833 BMW 4 Series adverts across the UK, adjusting for age, mileage, trim, engine and other specifications. It first appeared in our advert records 7 days ago. According to the government's MOT record, its advertised mileage is consistent with the latest test. The seller is Vertu BMW Exeter, based in Exeter. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 5 November 2026.

How we estimate prices and check cars

Price

Above the going rate: £2,363 (8%) over the AskCar estimate of £26,937.

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 1,833 priced BMW 4 Series adverts across different ages and specifications, as of 5 November 2026.

A 2021 BMW 4 Series with the 2.0 petrol engine is typically advertised at £24,000: the median of the 149 for sale on AskCar, as of 5 November 2026.

Time on sale

This 2021 BMW 4 Series has been on sale for at least 7 days.

Price history

AskCar first saw this advert on 29 October 2026 at £29,300. 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 5 November 2026: valid until 21 October 2027.

It has had 3 MOTs. The latest, on 22 October 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 17,141 miles, which matches the advertised 17,141 miles.

Advertised mileage is about 26,900 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 5 November 2026.

The 3 closest to this car in mileage:

• 2021 BMW 4 Series M Sport, 2.0 petrol convertible, white. Mileage: 12,820 miles. Price: £27,000, £2,300 less than this car. Dealer: Hedin Automotive Enfield BMW in Enfield. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-5519f689856d
• 2021 BMW 4 Series M Sport, 2.0 petrol convertible, green. Mileage: 12,250 miles. Price: £33,950, £4,650 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, black. Mileage: 22,399 miles. Price: £27,195, £2,105 less than this car. Dealer: John Clark BMW Tayside in Dundee. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-9751e81829b1

• The nearest: 2021 BMW 4 Series M Sport, 2.0 petrol convertible, white, 66 miles from this car. Mileage: 33,607 miles. Price: £24,850, £4,450 less than this car. Dealer: Evans Halshaw Vauxhall Newport in Newport. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-b45f7103a93e