2021 BMW 4 Series 2.0 420i M Sport PRO Edition

Overview

• Make: BMW
• Model: 4 Series
• Trim: M Sport PRO Edition
• Version: 2.0 420i M Sport Pro Edition Auto RWD Euro 6 (s/s) 2dr (181 bhp)
• Year: 2021
• Mileage: 23,667 miles
• Fuel: Petrol
• Body: Convertible, 2 doors, 4 seats
• Engine: 2.0 litres, 181 bhp
• Gearbox: Automatic
• Drive: Rear-wheel drive
• Colour: Blue
• CO2: 160 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

At 23,667 miles, this 2021 BMW 4 Series M Sport Pro Edition has covered about 20,400 fewer miles than other 2021 BMW 4 Series cars. The AskCar estimate for this car is £28,711. It is priced at £28,450, which is £261 below that estimate. To work out the AskCar estimate, we analyse UK dealer adverts for 1,825 BMW 4 Series cars across different ages and specifications. Since we first spotted the advert 30 days ago, the asking price has dropped by £900. The government's MOT record matches its advertised mileage. You can find this car at Car Planet Watford in Rickmansworth. How to contact the dealer and its opening hours are on this AskCar page.

Stock data as of 7 November 2026.

How we estimate prices and check cars

Price

Fair price: £261 (under 1%) under the AskCar estimate of £28,711.

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 1,825 priced BMW 4 Series adverts across different ages and specifications, as of 7 November 2026.

A 2021 BMW 4 Series with the 2.0 petrol engine is typically advertised at £24,000: the median of the 143 for sale on AskCar, as of 7 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 8 October 2026 at £29,350. Its asking price is now £28,450, £900 less. The latest price cut was seen on 2 November 2026.

Price changes recorded:

• 8 October 2026: £29,350
• 21 October 2026: £29,050
• 27 October 2026: £28,750
• 2 November 2026: £28,450

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 7 November 2026: valid until 11 June 2027.

It has had 3 MOTs. The latest, on 4 June 2026, passed.

There were no advisories at the latest test.

Mileage at that test: 22,188 miles, which matches the advertised 23,667 miles.

Advertised mileage is about 20,400 miles lower than the median mileage of a 2021 BMW 4 Series on AskCar.