2021 BMW 4 Series 2.0 420i M Sport

Overview

• Make: BMW
• Model: 4 Series
• Trim: M Sport
• Version: 2.0 420i M Sport [Tech/Pro Pack] Auto RWD Euro 6 2dr Step (181 bhp)
• Year: 2021
• Mileage: 46,150 miles
• Fuel: Petrol
• Body: 2 doors, 4 seats
• Engine: 2.0 litres, 181 bhp
• Gearbox: Automatic
• Drive: Rear-wheel drive
• Colour: Blue
• CO2: 152 g/km
• Emissions standard: Euro 6, ULEZ compliant

About this car

This 2021 BMW 4 Series M Sport has covered 46,150 miles, around 2,100 more miles than is typical for its age. The dealer is asking £23,750, which is £457 below the AskCar estimate of £24,207. To work out the AskCar estimate, we analyse UK dealer adverts for 1,826 BMW 4 Series cars across different ages and specifications. Since we first spotted the advert 56 days ago, the asking price has dropped by £1,250. The government's MOT record matches its advertised mileage. You can find this car at Sytner Sunningdale BMW in Ascot. 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: £457 (1%) under the AskCar estimate of £24,207.

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 56 days.

Price history

AskCar first saw this advert on 11 September 2026 at £25,000. Its asking price is now £23,750, £1,250 less. The latest price cut was seen on 4 November 2026.

Price changes recorded:

• 11 September 2026: £25,000
• 1 October 2026: £24,500
• 15 October 2026: £24,250
• 4 November 2026: £23,750

Mileage and MOT

MOT, from the government's MOT records (DVSA, the Driver and Vehicle Standards Agency), as of 6 November 2026: valid until 18 July 2027.

It has had 4 MOTs. The latest, on 13 July 2026, passed.

Advisories at the latest test: nearside front shock absorbers has light misting of oil; nearside rear nail in tyre.

Mileage at that test: 44,864 miles, which matches the advertised 46,150 miles.

Advertised mileage is about 2,100 miles higher than the median mileage of a 2021 BMW 4 Series on AskCar.