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: 40,178 miles
• Fuel: Petrol
• Body: Coupe, 2 doors, 4 seats
• Engine: 2.0 litres, 181 bhp
• Gearbox: Automatic
• Drive: Rear-wheel drive
• Colour: Blue
• CO2: 151 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 BMW 4 Series M Sport has covered 40,178 miles, around 3,900 fewer miles than is typical for its age. The dealer is asking £22,100, which is £2,181 below the AskCar estimate of £24,281. To work out the AskCar estimate, we analyse UK dealer adverts for 1,833 BMW 4 Series cars across different ages and specifications. Since we first spotted the advert 30 days ago, the asking price has dropped by £1,200. We checked its advertised mileage against the government's MOT record, and they match. You can find this car at Car Planet Barnet in New Southgate. 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

Good value: £2,181 (8%) under the AskCar estimate of £24,281.

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 30 days.

Price history

AskCar first saw this advert on 6 October 2026 at £23,300. Its asking price is now £22,100, £1,200 less. The latest price cut was seen on 5 November 2026.

Price changes recorded:

• 6 October 2026: £23,300
• 17 October 2026: £23,000
• 23 October 2026: £22,700
• 30 October 2026: £22,400
• 5 November 2026: £22,100

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 5 November 2026: valid until 13 March 2027.

It has had 5 MOTs. The latest, on 6 March 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 38,125 miles, which matches the advertised 40,178 miles.

Advertised mileage is about 3,900 miles lower than the median mileage of a 2021 BMW 4 Series on AskCar.

Similar cars

48 other 2021 BMW 4 Series M Sport 2.0 petrol automatic coupes are for sale at UK dealers, from £17,490 to £27,975, as of 5 November 2026.

The 3 closest to this car in mileage:

• 2021 BMW 4 Series M Sport, 2.0 petrol coupe, blue. Mileage: 40,447 miles. Price: £24,699, £2,599 more than this car. Dealer: Stratstone Bmw Leeds in Leeds. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-c8514b5e6e89
• 2021 BMW 4 Series M Sport, 2.0 petrol coupe, white. Mileage: 39,126 miles. Price: £23,490, £1,390 more than this car. Dealer: JCT600 Volkswagen Bradford in Bradford. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-0d291c8a2c44
• 2021 BMW 4 Series M Sport, 2.0 petrol coupe, blue. Mileage: 39,000 miles. Price: £24,995, £2,895 more than this car. Dealer: Q Performance Ltd / My1stcar.org in Blackburn. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-4beb869d660f

• The nearest: 2021 BMW 4 Series M Sport, 2.0 petrol coupe, green, under a mile from this car. Mileage: 69,441 miles. Price: £20,650, £1,450 less than this car. Dealer: Car Planet Barnet in Barnet. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-c80af27cad41