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: 69,441 miles
• Fuel: Petrol
• Body: Coupe, 2 doors, 4 seats
• Engine: 2.0 litres, 181 bhp
• Gearbox: Automatic
• Drive: Rear-wheel drive
• Colour: Green
• CO2: 151 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 BMW 4 Series M Sport has covered 69,441 miles, around 25,400 more miles than is typical for its age. The AskCar estimate for this car is £20,299. It is priced at £20,650, which is £351 above that estimate. The AskCar estimate uses 1,833 UK dealer adverts for the BMW 4 Series, with adjustments for age, mileage, trim, engine and other specifications. It first appeared in our advert records 11 days ago. We checked its advertised mileage against the government's MOT record, and they match. The seller is Car Planet Barnet, based 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

Fair price: £351 (1%) over the AskCar estimate of £20,299.

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 11 days.

Price history

AskCar first saw this advert on 25 October 2026 at £20,650. 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 28 November 2026.

It failed its MOT on 6 November 2025 (offside front tyre has ply or cords exposed) and passed 1 day later, on 7 November 2025.

Advisories at the latest test: offside rear tyre worn close to legal limit/worn on edge 3mm.

Mileage at that test: 61,116 miles, which matches the advertised 69,441 miles.

Advertised mileage is about 25,400 miles higher 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, white. Mileage: 70,584 miles. Price: £19,950, £700 less than this car. Dealer: Staffordshire Car Company in Stoke-on-Trent. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-e032643e2607
• 2021 BMW 4 Series M Sport, 2.0 petrol coupe, red. Mileage: 60,566 miles. Price: £22,149, £1,499 more than this car. Dealer: Greendale Car Sales in Hawick. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-26cecc1cf030
• 2021 BMW 4 Series M Sport, 2.0 petrol coupe, blue. Mileage: 58,347 miles. Price: £21,995, £1,345 more than this car. Dealer: Richard Greer Car Sales in Ballyclare. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-581b1cbc102c

• The nearest: 2021 BMW 4 Series M Sport, 2.0 petrol coupe, blue, under a mile from this car. Mileage: 40,178 miles. Price: £22,100, £1,450 more than this car. Dealer: Car Planet Barnet in Barnet. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-c04d0adf89d9