BMW 420 used • 1,540 cars price-checked by AutoUncle

Market overviewUsed BMW 420 prices typically range from £8,495 to £43,150, averaging £22,702 (according to fresh market data from January). The most popular BMW 420 variants right now are M Sport, Sport Line, Comfort Edition. We have identified 331 cars priced below the market. The average selling time for used BMW 420 is currently 43 days.

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Good price

Fair price

A bit pricey

Expensive

-4%
1 / 4

Used (2020) BMW 420 M Sport 190 HP | Good price

- 4 Series Gran Coupe d [190] M

  • 2020
  • 51,701 miles
  • Trim levelM Sport
  • 2.0L Diesel
  • Coupe
  • Automatic
  • 190 HP (139 kW)
  • mpg5.8
  • CO2151 g CO2/km comb.
  • Details
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Good price

£14,999
£15,722
SR53NX, Tyne and Wear
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1 / 2

Used (2020) BMW 420 M Sport 184 HP | Super price

- 4 Series i xDrive M Sport 2dr

  • 2020
  • 42,760 miles
  • Trim levelM Sport
  • 2.0L Petrol
  • Coupe
  • Automatic
  • 184 HP (135 kW)
  • mpg7.8
  • CO2179 g CO2/km comb.
  • Details
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Super price

£16,397
£16,217
SO317FL Southampton, Hampshire
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-3%
1 / 4

Used (2020) BMW 420 M Sport 190 HP | Good price

- 4 Series Gran Coupe d [190] M

  • 2020
  • 49,143 miles
  • Trim levelM Sport
  • 2.0L Diesel
  • Coupe
  • Automatic
  • 190 HP (139 kW)
  • mpg5.8
  • CO2151 g CO2/km comb.
  • Details
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Good price

£14,936
£15,495
LE26BW Leicester, Leicestershire
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1 / 4

Used (2021) BMW 420 M Sport 184 HP | Super price

- 4 Series Gran Coupe i M Sport

  • 2021
  • 38,164 miles
  • Trim levelM Sport
  • 2.0L Petrol
  • Coupe
  • Automatic
  • 184 HP (135 kW)
  • mpg7.3
  • CO2169 g CO2/km comb.
  • Details
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Super price

£17,450
£17,150
DE655FJ Hilton, Derbyshire
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1 / 4

Used (2020) BMW 420 M Sport 184 HP | Good price

4 Series i M Sport 5dr Auto

  • 2020
  • 36,369 miles
  • Trim levelM Sport
  • 2.0L Petrol
  • Coupe
  • Automatic
  • 184 HP (135 kW)
  • mpg7.3
  • CO2169 g CO2/km comb.
  • Details
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Good price

£17,150
£17,200
DE655FJ Hilton, Derbyshire
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-3%
1 / 4

Used (2020) BMW 420 M Sport 184 HP | Super price

- 4 Series i M Sport 2dr Auto

  • 2020
  • 49,500 miles
  • Trim levelM Sport
  • 2.0L Petrol
  • Coupe
  • Automatic
  • 184 HP (135 kW)
  • mpg7.3
  • CO2170 g CO2/km comb.
  • Details
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Super price

£15,150
£15,750
DE655FJ Hilton, Derbyshire
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-6%
1 / 3

Used (2021) BMW 420 M Sport 190 HP | Good price

4 Series d MHT M Sport 2dr Step

  • 2021
  • 30,439 miles
  • Trim levelM Sport
  • 2.0L Diesel
  • Cabriolet
  • Automatic
  • 190 HP (139 kW)
  • mpg4.9
  • CO2129 g CO2/km comb.
  • Details
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Good price

£24,350
£26,150
WD33RT Watford, Hertfordshire
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-6%
1 / 3

Used (2024) BMW 420 M Sport 184 HP | Good price

4 Series i M Sport 5dr Step Auto

  • 2024
  • 17,083 miles
  • Trim levelM Sport
  • 2.0L Petrol
  • Hatchback
  • Automatic
  • 184 HP (135 kW)
  • mpg42
  • CO2153 g CO2/km comb.
  • Details
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Good price

£34,390
£36,745
YO304WR, North Yorkshire
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-7%
1 / 3

Used (2020) BMW 420 M Sport 184 HP | Super price

- 4 Series Convertible i M Sport

  • 2020
  • 81,678 miles
  • Trim levelM Sport
  • 2.0L Petrol
  • Cabriolet
  • Automatic
  • 184 HP (135 kW)
  • mpg8
  • CO2182 g CO2/km comb.
  • Details
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Super price

£11,995
£12,995
G513JH, Glasgow
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-17%
1 / 4

Used (2024) BMW 420 M Sport 184 HP | Super price

4 Series i M Sport Convertible 2.0

  • 2024
  • 11,312 miles
  • Trim levelM Sport
  • 2.0L Petrol
  • Cabriolet
  • Automatic
  • 184 HP (135 kW)
  • mpg38.2
  • CO2154 g CO2/km comb.
  • Details
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Super price

£35,965
£43,500
PO35FF, Hampshire
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-9%
1 / 4

Used (2020) BMW 420 M Sport 190 HP | Super price

- 4 Series Convertible d [190] M

  • 2020
  • 52,255 miles
  • Trim levelM Sport
  • 2.0L Diesel
  • Cabriolet
  • Automatic
  • 190 HP (139 kW)
  • mpg5.9
  • CO2156 g CO2/km comb.
  • Details
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Super price

£14,550
£15,990
DE655FJ Hilton, Derbyshire
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-6%
1 / 4

Used (2022) BMW 420 M Sport 190 HP | Super price

4 Series d MHT M Sport 2dr Step

  • 2022
  • 21,200 miles
  • Trim levelM Sport
  • 2.0L Diesel
  • Cabriolet
  • Automatic
  • 190 HP (139 kW)
  • mpg4.9
  • CO2129 g CO2/km comb.
  • Details
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Super price

£27,950
£30,000
RH123ZG, West Sussex
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-15%
1 / 4

Used (2024) BMW 420 M Sport 184 HP | Super price

4 Series i M Sport Convertible 2.0

  • 2024
  • 19,073 miles
  • Trim levelM Sport
  • 2.0L Petrol
  • Cabriolet
  • Automatic
  • 184 HP (135 kW)
  • mpg41.5
  • CO2154 g CO2/km comb.
  • Details
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Super price

£34,695
£41,183
PO35FF, Hampshire
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-5%
1 / 4

Used (2020) BMW 420 M Sport 190 HP | Good price

- 4 Series Convertible d [190] M

  • 2020
  • 36,219 miles
  • Trim levelM Sport
  • 2.0L Diesel
  • Cabriolet
  • Automatic
  • 190 HP (139 kW)
  • mpg5.9
  • CO2156 g CO2/km comb.
  • Details
autouncle-certified

Good price

£17,495
£18,562
E65LU, London
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1 / 4

Used (2021) BMW 420 M Sport 184 HP | Super price

- 4 Series Gran Coupe i xDrive M

  • 2021
  • 42,786 miles
  • Trim levelM Sport
  • 2.0L Petrol
  • Coupe
  • Automatic
  • 184 HP (135 kW)
  • mpg7.8
  • CO2178 g CO2/km comb.
  • Details
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Super price

£18,550
£18,450
DE655FJ Hilton, Derbyshire
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1 / 4

Used (2021) BMW 420 M Sport 184 HP | Super price

- 4 Series Gran Coupe i M Sport

  • 2021
  • 42,565 miles
  • Trim levelM Sport
  • 2.0L Petrol
  • Coupe
  • Automatic
  • 184 HP (135 kW)
  • mpg7.3
  • CO2169 g CO2/km comb.
  • Details
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Super price

£17,650
£16,950
DE655FJ Hilton, Derbyshire
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1 / 1

Used (2020) BMW 420 M Sport 190 HP | Good price

- 4 Series Gran Coupe d [190] M

  • 2020
  • 67,035 miles
  • Trim levelM Sport
  • 2.0L Diesel
  • Coupe
  • Automatic
  • 190 HP (139 kW)
  • mpg5.8
  • CO2151 g CO2/km comb.
  • Details
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Good price

£13,450
£13,350
DE655FJ Hilton, Derbyshire
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-1%
1 / 1

Used (2021) BMW 420 M Sport 184 HP | Super price

- 4 Series Gran Coupe i M Sport

  • 2021
  • 63,000 miles
  • Trim levelM Sport
  • 2.0L Petrol
  • Coupe
  • Automatic
  • 184 HP (135 kW)
  • mpg7.3
  • CO2169 g CO2/km comb.
  • Details
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Super price

£14,250
£14,450
DE655FJ Hilton, Derbyshire
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-1%
1 / 4

Used (2020) BMW 420 M Sport 190 HP | Super price

- 4 Series d [190] M Sport 2dr

  • 2020
  • 71,526 miles
  • Trim levelM Sport
  • 2.0L Diesel
  • Coupe
  • Automatic
  • 190 HP (139 kW)
  • mpg5.7
  • CO2149 g CO2/km comb.
  • Details
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Super price

£12,250
£12,490
ME123RT, Kent
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1 / 4

Used (2021) BMW 420 M Sport 184 HP | Super price

- 4 Series Gran Coupe i M Sport

  • 2021
  • 45,101 miles
  • Trim levelM Sport
  • 2.0L Petrol
  • Coupe
  • Automatic
  • 184 HP (135 kW)
  • mpg7.3
  • CO2169 g CO2/km comb.
  • Details
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Super price

£17,190
£16,750
CF118AQ, South Glamorgan
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1 / 4

Used (2020) BMW 420 M Sport 190 HP | Super price

4 Series d [190] M Sport 2dr Auto

  • 2020
  • 27,733 miles
  • Trim levelM Sport
  • 2.0L Diesel
  • Coupe
  • Automatic
  • 190 HP (139 kW)
  • mpg5.7
  • CO2149 g CO2/km comb.
  • Details
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Super price

£16,999
£17,149
G329QA
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1 / 4

Used (2020) BMW 420 M Sport 190 HP | Good price

- 4 Series d [190] M Sport 2dr

  • 2020
  • 19,786 miles
  • Trim levelM Sport
  • 2.0L Diesel
  • Coupe
  • Automatic
  • 190 HP (139 kW)
  • mpg5.7
  • CO2149 g CO2/km comb.
  • Details
autouncle-certified

Good price

£17,849
£17,999
S91XU, South Yorkshire
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-7%
1 / 4

Used (2024) BMW 420 M Sport 184 HP | Super price

4 Series i M Sport 5dr Step

  • 2024
  • 6,326 miles
  • Trim levelM Sport
  • 2.0L Petrol
  • Coupe
  • Automatic
  • 184 HP (135 kW)
  • mpg6.6
  • CO2153 g CO2/km comb.
  • Details
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Super price

£33,049
£35,899
E47PX Chingford, London
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-4%
1 / 4

Used (2020) BMW 420 M Sport 190 HP | Good price

4 Series d [190] M Sport 2dr Auto

  • 2020
  • 36,204 miles
  • Trim levelM Sport
  • 2.0L Diesel
  • Coupe
  • Automatic
  • 190 HP (139 kW)
  • mpg5.7
  • CO2149 g CO2/km comb.
  • Details
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Good price

£18,099
£18,999
DH32BQ Birtley, Durham
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-10%
1 / 4

Used (2022) BMW 420 Comfort Edition 190 HP | Good price

4 SERIES DIESEL CONVERTIBLE d MHT

  • 2022
  • 52,830 miles
  • Trim levelComfort Edition
  • 2.0L Diesel
  • Cabriolet
  • Automatic
  • 190 HP (139 kW)
  • mpg4.9
  • CO2129 g CO2/km comb.
  • Details
autouncle-certified

Good price

£24,199
£26,999
CW73AL, Cheshire
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Showing 1 - 25 of 1,485 results

How much does the BMW 420 depreciate?

Used BMW 420

A used BMW 420 (2025) model gains about £73 per month in value.


Factors that affect the appreciation of a BMW 420:
- Mileage
- Age of the vehicle
- Number of previous owners
- Accidents or damage history
- Trim level, equipment, and options


Appreciation is an important part of calculating the total value of owning a BMW 420. In addition to the monthly appreciation of £73, you should also factor in fuel costs, road tax, insurance and maintenance (including tyres and car washes) to get the full monthly value.

How much does a used BMW 420 cost? Prices, ratings and depreciation by model year

How much does a used BMW 420 cost? Prices, ratings and depreciation by model year

Model year

Price range*

Avg. Price

Depreciation
(12 mth.)

Cars for sale

2025 BMW 420

£24,822 - £49,875£38,943+£880258

2024 BMW 420

£32,500 - £50,994£38,441-£3,30048

2023 BMW 420

£27,699 - £34,975£31,273-£2,64090

2022 BMW 420

£23,440 - £31,950£27,904-£1,800212

2021 BMW 420

£17,190 - £29,990£25,260-£1,380153

2019 BMW 420

£12,990 - £20,549£16,918-£660128

2020 BMW 420

£10,495 - £22,998£16,416-£3,180115

2018 BMW 420

£10,999 - £17,898£14,571-£1,180128

2017 BMW 420

£8,795 - £16,993£12,858-£240121

2016 BMW 420

£6,995 - £15,000£11,278-£780102

2015 BMW 420

£6,550 - £14,500£10,228-£64096

2014 BMW 420

£6,494 - £13,990£9,608-£18074

2013 BMW 420

£5,495 - £14,000£8,458-£36013

*The 'Price range' column shows the prices at the 5th and 95th percentiles of cars in the current market

The data is based on the cars currently listed on AutoUncle

Last updated: 10 January 2026

Comparison of BMW 420 variants and prices

Below you can compare prices and depreciation for the 4 most popular BMW 420 variants. The table is updated daily with data from the market in United Kingdom.

Comparison of BMW 420 variants and prices

Variant

Price range*

Avg. Price

Depreciation
(12 mth.)

Cars for sale

🏆 The most popular

BMW 420 M Sport

£8,995 - £43,490£23,647+£9001,426

BMW 420 Comfort Edition

£5,495 - £25,799£11,638+£16019

BMW 420 Sport Line

£5,495 - £16,950£10,963-£66063
💰 The budget choice

BMW 420 Luxury Line

£6,995 - £13,800£10,781-£26020

*The 'Price range' column shows the prices at the 5th and 95th percentiles of cars in the current market

The data is based on the cars currently listed on AutoUncle

Last updated: 10 January 2026

Which variant should you choose?

💰 The budget choice

The Luxury Line is the cheapest entry point with an average price of £10,781.

🏆 The most popular

There are the most M Sport for sale right now (1426), which gives you the most options to choose from.

📈 The best value

The M Sport has held its price stable with minimal loss in value over the past year (+£900).

BMW 420 (model year 2025) - Price development for the last 10 months and price projection for the next 6 months (March 2025 - June 2026)

Monthly price data with average prices and price ranges

Month

Average market price

Lowest market price

Highest market price

Calculation method

2025 - March
£39,920
£32,040£47,820
Estimate
2025 - April
£36,000
£27,680£44,320
Estimate
2025 - May
£35,920
£27,160£44,700
Estimate
2025 - June
£42,180
£34,280£50,080
Estimate
2025 - July
£43,720
£38,200£49,240
Estimate
2025 - August
£44,400
£40,160£48,640
Estimate
2025 - September
£44,660
£40,980£48,340
Estimate
2025 - October
£43,920
£38,660£49,180
Estimate
2025 - November
£41,260
£35,760£46,780
Estimate
2025 - December
£40,800
£36,220£45,400
Estimate
2026 - February
£39,640
--
Forecast
2026 - March
£39,060
--
Forecast
2026 - April
£38,480
--
Forecast
2026 - May
£37,900
--
Forecast
2026 - June
£37,320
--
Forecast

All estimates and forecasts are based on actual market data

Last updated: 10 January 2026

Average Monthly Depreciation

A summary of the past 12 and an estimation of the next 6 months.

Past 12 months

£880

Next 6 months

-£3,480

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Price checked by AutoUncle

Super price

Good price

Fair price

A bit pricey

Expensive

Should your next car be the impressive BMW 420?

BMW 420 offers fantastic driving comfort and its design has received numerous awards. At AutoUncle, we've assembled an impressive collection of 1,733 used BMW 420 cars in the UK gathered from numerous dealership websites and online marketplaces.

What should I pay for a used BMW 420?

A used BMW 420 costs between £8,950 for the cheapest variant and £43,789 for the most expensive model.

The popular BMW 420 is being offered at different prices depending on primarily five factors: manufacturing year, engine size and performance, fuel efficiency of the car, vehicle mileage not to mention the equipment level of the car.

For instance, a car that is newer and has fewer miles on the clock will typically command a higher price. In the same vein, models at the higher end, replete with luxurious features or more robust engines, generally come with a more substantial price tag than a used model with many kilometres on the odometer and in a simple equipment variant.

What equipment packages does the BMW 420 offer?

The BMW 420 presents a wide variety of trim configurations to cater to different driving tastes and requirements. The most popular ones are:

When examining the market value of a used BMW 420, it's imperative to examine vehicles that have the same engines and features. Otherwise, you might draw an inaccurate conclusion about which car to purchase.

How many different fuel types can I choose from for the BMW 420?

The primary energy source for the BMW 420 is petrol.

Compare fuel types for BMW 420:

  • BMW 420 petrol: 908 cars currently available with an average price of £27,458
  • BMW 420 diesel: 802 cars currently available with an average price of £15,373
  • BMW 420 plug-in hybrid: Currently there is 23 cars available on AutoUncle with an average price of £28,998

We advocate for a careful review of your driving habits before you commit to a fuel type. Is your driving mainly in the city or on long stretches of open roads and motorways? What's your typical weekly driving distance?

For short journeys, electric cars, plug-in hybrids or petrol cars are obvious choices. For longer daily commutes, a modern electric car is often suitable - especially if you can charge at home or at work. Diesel cars may still be relevant in some cases with very long journeys and lack of charging options. Consider that in many countries, cities have banned the entry of diesel engines with high emissions.

Does the BMW 420 have multiple body styles?

The BMW 420 is available in several body types, but the most popular version is coupe. The coupe as a body type prioritises style and sporty driving. Compared to a sedan or an SUV, the chassis tends to be tighter and stronger. This body type is mostly for people without children, who usually travel light. This style is often more expensive than equivalent sedan or hatchback sister models.

What is the price difference between different body types for BMW 420?

  • BMW 420 coupe: 1,212 cars - average price £21,709
  • BMW 420 cabriolet: 301 cars - average price £25,604
  • BMW 420 hatchback](https://www.autouncle.co.uk/en-gb/used-cars/BMW/420/b-hatchback): 207 cars - average price £17,408
  • BMW 420 sedan: 7 cars - average price £22,625

Which models are comparable to BMW 420?

While being particularly popular, the German BMW 420 has some competitors.

Alternative cars to the BMW 420

  • Audi TT
  • Mazda MX5
  • BMW Z4

The Audi TT is a strong alternative to the BMW 420. With an average sales price of £13,990 you'll currently discover a substantial selection of 1,042 of these cars available for purchase on AutoUncle.

The Mazda MX5 is a strong option in this segment, with 689 cars currently for sale on AutoUncle and an average price of £14,695. The BMW Z4 comes in as the third most popular choice with an average sales price of £16,950 and 551 car for sale at the moment in the UK.

In pursuit of a more sustainable counterpart to the BMW 420?

Considering something greener than the BMW 420? Check out these electric alternatives from the same segment::

Haven't found an electric car that resonates with you? Review our entire selection of electric cars here.

All body types for BMW 420

All regions for BMW 420

All fuel types for BMW 420

All gear types for BMW 420