2021 BMW 4 Series

Overview

Make

BMW

Model

4 Series

Trim

M SPORT

Version

2.0 420i M Sport Auto RWD Euro 6 (s/s) 2dr (181 bhp)

Mileage

37,652 miles

Year

2021

Fuel type

Petrol

Body type

Convertible

Engine

2.0 L

Gearbox

Automatic

Power

181 bhp

Seats

4

CO2

160 g/km

Colour

White

Doors

2

Driven wheels

Rear Wheel Drive

Engine badge

420i

Emissions standard

Euro 6

About this car

This 2021 BMW 4 Series M Sport is advertised with 37,652 miles, approximately 4,300 below the typical mileage for its age. Our estimated market asking price is £24,715. This car is advertised at £23,150, which is £1,565 below that figure. To estimate its market asking price, we analyse UK dealer adverts for 1,749 BMW 4 Series cars across different ages and specifications. The asking price is now £2,950 lower than when we first recorded the advert 117 days ago. It may give you a starting point for a conversation about price. Its recorded MOT is valid until 30 June 2027, and its advertised mileage is consistent with the latest MOT reading. It is for sale at Car Planet Watford in Rickmansworth.

Stock data from 21 October 2026.

How we estimate prices and check cars

Price and mileage comparison

Estimated market asking price: £24,715. The asking price is £1,565 below this estimate.

The estimate uses UK dealer asking prices, accounting for make, model, trim, version, age, mileage, fuel, gearbox, body type, driven wheels, engine size and power. It estimates an advertised price, not a confirmed sale price.

The pricing calculation includes 1,749 adverts of this make and model across different ages and specifications.

Advertised mileage is approximately 4,300 miles lower than typical for a 2021 BMW 4 Series.

The advertised mileage is consistent with the last MOT reading.