2021 BMW 4 Series

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

£28,900

Above the going rate: £2,242 over the typical £26,658 for this model, age and mileage, drawing on 1,725 adverts of this make and model.

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
23,434 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
Grey
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 23,434 miles, approximately 18,600 below the typical mileage for its age. At £28,900, it is advertised £2,242 above our estimated market asking price of £26,658. To estimate its market asking price, we analyse UK dealer adverts for 1,725 BMW 4 Series cars across different ages and specifications. The asking price is now £100 lower than when we first recorded the advert 75 days ago. Our latest MOT record expired on 29 September 2026. Check the current position with the dealer. Its advertised mileage is consistent with the latest recorded MOT reading. The seller is Sytner Stevenage BMW, based in Stevenage.

Stock data from 23 October 2026.

How we estimate prices and check cars

Price history

First seen on 12 August 2026, 75 days ago. Advert duration calculated on 26 October 2026. Net asking-price reduction: £100 from the first recorded £29,000. 2 price reductions recorded, the latest observed on 17 October 2026.

Recorded asking prices
Date observedAsking price
12 August 2026£29,000
16 September 2026£30,000
3 October 2026£29,500
17 October 2026£28,900
23 October 2026£28,900

Price and mileage comparison

Estimated market asking price: £26,658. The asking price is £2,242 above 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 1,725 adverts of this make and model across different ages and specifications.

Advertised mileage is approximately 18,600 miles lower than typical for a 2021 BMW 4 Series.

The advertised mileage is consistent with the last MOT reading.

The recorded MOT has expired; ask the dealer for an up-to-date MOT.

MOT

MOT valid until 29 September 2026. 19,065 miles at the last test.

84 other cars with the same year, trim, gearbox and fuel are for sale from £16,995 to £41,000.

Other matching cars (up to five, cheapest first)
Asking priceMileage
£16,99596,000 miles
£17,49056,431 miles
£18,99097,313 miles
£19,90077,199 miles
£20,95070,584 miles

Matching year, trim, gearbox and fuel does not mean matching mileage or every specification. Our estimate adjusts for these differences using the wider market data.

Browse all BMW 4 Series cars for sale · 2021 BMW 4 Series price guide

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