2021 BMW 4 Series 2.0 420i M Sport
Version: 2.0 420i M Sport Auto RWD Euro 6 (s/s) 2dr (181 bhp)
Price: £26,750. Fair price: £1,687 (6%) over the AskCar estimate of £25,063, our expected asking price for this car from its model, age, mileage and specification, drawing on 1,775 priced BMW 4 Series adverts on AskCar as of 31 October 2026.
AskCar lists 1,813 used BMW 4 Series from 1,042 UK dealerships, as of 31 October 2026.
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
- 36,115 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
- Blue
- 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 36,115 miles, approximately 7,500 below the typical mileage for its age. Its asking price of £26,750 is £1,687 above the AskCar estimate of £25,063. The AskCar estimate uses UK dealer asking prices, including 1,775 BMW 4 Series adverts, and accounts for the car’s age, mileage and specification. Since we first spotted the advert 28 days ago, the asking price has dropped by £200. MOT records show an expiry date of 7 May 2027, and the latest recorded mileage is consistent with the advert. The seller is Sytner Luton BMW, based in Luton.
Stock data as of 31 October 2026.
Price history
AskCar first saw this advert on 3 October 2026, 28 days ago. Price reduced by £200 from £26,950 since AskCar first saw it. 1 price reduction recorded, the latest seen on 17 October 2026.
| Date observed | Asking price |
|---|---|
| 3 October 2026 | £26,950 |
| 17 October 2026 | £26,750 |
| 31 October 2026 | £26,750 |
Price and mileage comparison
Fair price: £1,687 (6%) over the AskCar estimate of £25,063.
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 1,775 priced BMW 4 Series adverts across different ages and specifications, as of 31 October 2026.
Advertised mileage is about 7,500 miles lower than the median mileage of a 2021 BMW 4 Series on AskCar.
The advertised mileage is consistent with the last MOT reading.
MOT
MOT: valid until 7 May 2027. 34,227 miles at the last test.
Other matching cars
81 other 2021 BMW 4 Series M Sport automatic petrol cars are for sale at UK dealers from £16,995 to £33,950, as of 31 October 2026.
The 5 cheapest:
- 2021 BMW 4 Series. Price: £16,995. Mileage: 96,000 miles. Dealer: Motorhouse (Beds) in Bedford. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-b61ce310b6dc
- 2021 BMW 4 Series. Price: £17,490. Mileage: 56,431 miles. Dealer: Car Holics in Hillingdon. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-50114104eb76
- 2021 BMW 4 Series. Price: £18,990. Mileage: 97,313 miles. Dealer: CS Autos Prestige Cars in Addlestone. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-affda13ef70c
- 2021 BMW 4 Series. Price: £19,900. Mileage: 77,199 miles. Dealer: Sytner Select Swindon in Swindon. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-83a0c15e0ab2
- 2021 BMW 4 Series. Price: £19,950. Mileage: 70,584 miles. Dealer: Staffordshire Car Company in Stoke-on-Trent. AskCar page: https://askcar.co.uk/car/bmw-4-series-2021-e032643e2607
Matching year, trim, gearbox and fuel does not mean matching mileage or every specification. The AskCar estimate adjusts for these differences.
Browse all BMW 4 Series cars for sale · 2021 BMW 4 Series price guide
More like this
Photos
23 photos of this car are on its AskCar page.
How to contact the dealer and its opening hours are on this AskCar page.
As of 31 October 2026, AskCar lists 583,548 cars and vans from 12,716 UK dealerships, read daily from dealer websites: over 99% of UK dealer used car adverts. No dealer pays to be listed.