BMW 420 (petrol) • 683 cars with Valuation

Market overview: Petrol BMW 420 (June-2026): There are currently 683 used petrol BMW 420 cars for sale. Prices range from £10,500 to £48,228, with a median price of £26,998. AutoUncle has identified 149 cars as being offered below market price. The typical selling time for a petrol BMW 420 is approximately 19 days, and 50.9% of the listings have recently been reduced in price (Source: AutoUncle market data, June-2026).

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Carwow

Used BMW 420 M Sport 184 HP (135 kW) 2023 Coupe

(2023) BMW 420 M Sport 184 HP

Good price

You save £1,510

151 g CO2/km comb. - 184 HP (135 kW) - 6.6 Mpg

Carwow

Used BMW 420 M Sport 184 HP (135 kW) 2026 Coupe

(2026) BMW 420 M Sport 184 HP

Super price

You save £5,971

153 g CO2/km comb. - 184 HP (135 kW) - 6.6 Mpg

Carwow

Used BMW 420 M Sport 184 HP (135 kW) 2023 Green Coupe

(2023) BMW 420 M Sport 184 HP

Fair price

YO304WR, North Yorkshire

154 g CO2/km comb. - 184 HP (135 kW) - 40.0 Mpg

Carwow

Used BMW 420 M Sport 184 HP (135 kW) 2022 Blue Coupe

(2022) BMW 420 M Sport 184 HP

Good price

You save £1,536

NE36 0BQ West Boldon, Tyne And Wear

154 g CO2/km comb. - 184 HP (135 kW) - 42.0 Mpg

Price checked by AutoUncle

Super price

Good price

Fair price

A bit pricey

Expensive

-1%

1 / 4

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

4 SERIES GRAN COUPE i M Sport 5dr

2020
25,755 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 169 g CO2/km comb.
46.3 mpg
Details

Super price

£18,799

£19,099

CW7 Cheshire West And Chester, Cheshire

Availability verified

-11%

1 / 4

Used (2025) BMW 420 M Sport 184 HP | Good price

4 Series i M Sport Convertible 2.0

Sep 2025
5,799 miles
Trim level: M Sport
2.0L Petrol
Cabriolet
Automatic
184 HP (135 kW)
CO2 emissions: 154 g CO2/km comb.
41.5 mpg
Details

Good price

£39,950

£44,995

WC1E 7DP Greater London, London

Availability verified

-2%

1 / 4

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

- 4 Series Convertible i M Sport

2020
40,340 miles
Trim level: M Sport
2.0L Petrol
Cabriolet
Automatic
184 HP (135 kW)
CO2 emissions: 182 g CO2/km comb.
8 mpg
Details

Good price

£17,450

£17,850

N11 1GN Greater London, London

Availability verified

-1%

1 / 4

Used (2026) BMW 420 M Sport 184 HP | Super price

- 4 Series Gran Coupe i M Sport

2026
7,491 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 153 g CO2/km comb.
6.6 mpg
Details

Super price

£35,894

£36,508

RH15EP

Availability verified

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Carwow

Used BMW 420 M Sport 184 HP (135 kW) 2023 Coupe

(2023) BMW 420 M Sport 184 HP

Fair price

YO304WR, North Yorkshire

151 g CO2/km comb. - 184 HP (135 kW) - 6.6 Mpg

Carwow

Used BMW 420 M Sport 184 HP (135 kW) 2026 Coupe

(2026) BMW 420 M Sport 184 HP

Super price

You save £4,210

153 g CO2/km comb. - 184 HP (135 kW) - 6.6 Mpg

Carwow

Used BMW 420 M Sport 184 HP (135 kW) 2026 Coupe

(2026) BMW 420 M Sport 184 HP

Good price

You save £2,050

144 g CO2/km comb. - 184 HP (135 kW) - 6.3 Mpg

Carwow Leasing

New BMW 420 M Sport 184 HP (135 kW) 2026 Coupe

(2026) BMW 420 M Sport 184 HP

Super price

You save £4,056

DE21 Derby, Derbyshire

144 g CO2/km comb. - 184 HP (135 kW) - 6.3 Mpg

-1%

1 / 4

Used (2025) BMW 420 M Sport 184 HP | Super price

4 Series i M Sport Coupe 2.0

2025
2,889 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 144 g CO2/km comb.
44.8 mpg
Details

Super price

£34,996

£35,698

YO304WR, North Yorkshire

Availability verified

-5%

1 / 3

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

- 4 Series Convertible i M Sport

2020
30,717 miles
Trim level: M Sport
2.0L Petrol
Cabriolet
Automatic
184 HP (135 kW)
CO2 emissions: 182 g CO2/km comb.
8 mpg
Details

Super price

£16,863

£17,758

E65LU

Availability verified

-6%

1 / 3

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

- 4 Series Gran Coupe i M Sport

2021
71,505 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 169 g CO2/km comb.
7.3 mpg
Details

Super price

£13,708

£14,687

DL14 9TW Tindale Crescent, Durham

Availability verified

New

1 / 4

Used (2026) BMW 420 M Sport 184 HP | Good price

4 Series 2026 M Sport i 2dr Step

2026
16,593 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 144 g CO2/km comb.
6.3 mpg
Details

Good price

£36,950

HA36AG

Availability verified

-4%

1 / 3

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

- 4 Series Gran Coupe i M Sport

2021
35,872 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 169 g CO2/km comb.
7.3 mpg
Details

Super price

£17,200

£18,095

E65LU

Availability verified

-7%

1 / 3

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

- 4 Series Gran Coupe i M Sport

2020
26,781 miles
Trim level: M Sport
2.0L Petrol
Coupe
Manual
184 HP (135 kW)
CO2 emissions: 170 g CO2/km comb.
7.4 mpg
Details

Good price

£16,846

£18,256

RM13 8RH Greater London, London

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Carwow

Used BMW 420 M Sport 184 HP (135 kW) 2025 Red Cabriolet

(2025) BMW 420 M Sport 184 HP

Good price

You save £1,750

WC1E 7DP Greater London, London

154 g CO2/km comb. - 184 HP (135 kW) - 41.5 Mpg

Carwow

Used BMW 420 M Sport 184 HP (135 kW) 2025 Grey Coupe

(2025) BMW 420 M Sport 184 HP

Super price

You save £4,004

YO304WR, North Yorkshire

144 g CO2/km comb. - 184 HP (135 kW) - 44.8 Mpg

Carwow Leasing

New BMW 420 M Sport 184 HP (135 kW) 2026 Coupe

(2026) BMW 420 M Sport 184 HP

Super price

You save £5,200

144 g CO2/km comb. - 184 HP (135 kW) - 6.3 Mpg

Carwow

Used BMW 420 M Sport 184 HP (135 kW) 2026 Coupe

(2026) BMW 420 M Sport 184 HP

Super price

You save £3,406

153 g CO2/km comb. - 184 HP (135 kW) - 6.6 Mpg

-1%

1 / 4

Used (2026) BMW 420 M Sport 184 HP | Super price

- 4 Series Gran Coupe i M Sport

2026
19,376 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 153 g CO2/km comb.
6.6 mpg
Details

Super price

£31,929

£32,337

RH15EP

Availability verified

-2%

1 / 4

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

4 Series Gran Coupe 2021 | 2.0 i

2021
73,591 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 169 g CO2/km comb.
7.3 mpg
Details

Super price

£15,260

£15,700

GU15 3DT Surrey, Surrey

Availability verified

-1%

1 / 4

Used (2026) BMW 420 M Sport 184 HP | Super price

- 4 Series Gran Coupe i M Sport

2026
17,966 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 153 g CO2/km comb.
6.6 mpg
Details

Super price

£34,380

£34,995

RH101TN

Availability verified

-4%

1 / 4

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

- 4 Series Gran Coupe i M Sport

2021
94,000 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 169 g CO2/km comb.
7.3 mpg
Details

Good price

£12,900

£13,500

ST59DX

Availability verified

-9%

1 / 4

Used (2022) BMW 420 M Sport 184 HP | Good price

4 Series i xDrive M Sport 2dr Step

Oct 2022
24,191 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 154 g CO2/km comb.
42 mpg
Details

Good price

£26,664

£29,436

NE36 0BQ West Boldon, Tyne And Wear

Availability verified

-3%

1 / 4

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

- 4 Series i xDrive M Sport 2dr

2020
35,850 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 179 g CO2/km comb.
7.8 mpg
Details

Super price

£15,800

£16,295

W1H 7AB Greater London, London

Availability verified

1 / 3

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

- 4 Series Gran Coupe i M Sport

2021
64,410 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 169 g CO2/km comb.
7.3 mpg
Details

Super price

£14,475

BL99ST

Availability verified

-16%

1 / 4

Used (2025) BMW 420 M Sport 184 HP | Good price

4 Series i M Sport Coupe 2.0

2025
10,011 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 144 g CO2/km comb.
44.1 mpg
Details

Good price

£34,995

£41,999

RH10 1TN West Sussex, West Sussex

Availability verified

New (2026) BMW 420 M Sport 184 HP | Super price

- 4 Series Gran Coupe i M Sport

2026
0 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 153 g CO2/km comb.
6.6 mpg
Details

Super price

£44,750

IP31 1SX Fornham Saint Martin, Suffolk

Availability verified

1 / 1

New (2026) BMW 420 M Sport 184 HP | Super price

- 4 Series i M Sport 2dr Step

2026
0 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 144 g CO2/km comb.
6.3 mpg
Details

Super price

£44,544

DE21 Derby, Derbyshire

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Carwow Leasing

New BMW 420 M Sport 184 HP (135 kW) 2026 Coupe

(2026) BMW 420 M Sport 184 HP

Super price

You save £5,465

153 g CO2/km comb. - 184 HP (135 kW) - 6.6 Mpg

Carwow Leasing

New BMW 420 M Sport 184 HP (135 kW) 2026 Coupe

(2026) BMW 420 M Sport 184 HP

Good price

You save £3,309

153 g CO2/km comb. - 184 HP (135 kW) - 6.6 Mpg

Carwow

Used BMW 420 M Sport 184 HP (135 kW) 2026 Coupe

(2026) BMW 420 M Sport 184 HP

Super price

You save £3,720

153 g CO2/km comb. - 184 HP (135 kW) - 6.6 Mpg

Carwow

Used BMW 420 M Sport 184 HP (135 kW) 2025 Grey Coupe

(2025) BMW 420 M Sport 184 HP

Good price

You save £2,405

RH10 1TN West Sussex, West Sussex

144 g CO2/km comb. - 184 HP (135 kW) - 44.1 Mpg

1 / 4

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

- 4 Series i xDrive M Sport 2dr

2020
38,000 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 179 g CO2/km comb.
7.8 mpg
Details

Super price

£15,499

CM233LJ

Availability verified

1 / 4

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

4 Series Gran Coupe 2021 | 2.0 i

2021
52,460 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 169 g CO2/km comb.
7.3 mpg
Details

Super price

£17,300

WS11 1SL Staffordshire, Staffordshire

Availability verified

-3%

1 / 4

New (2026) BMW 420 M Sport 184 HP | Super price

- 4 Series i M Sport 2dr Step

2026
0 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 144 g CO2/km comb.
6.3 mpg
Details

Super price

£44,700

£46,500

S92RQ

Availability verified

-3%

1 / 3

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

- 4 Series Gran Coupe i M Sport

2021
79,000 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 169 g CO2/km comb.
7.3 mpg
Details

Good price

£14,000

£14,550

M445AH

Availability verified

-5%

1 / 3

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

- 4 Series Gran Coupe i M Sport

2021
46,533 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 169 g CO2/km comb.
7.3 mpg
Details

Super price

£16,410

£17,334

E65LU

Availability verified

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Carwow

Used BMW 420 M Sport 184 HP (135 kW) 2026 Coupe

(2026) BMW 420 M Sport 184 HP

Fair price

You save £1,375

153 g CO2/km comb. - 184 HP (135 kW) - 6.6 Mpg

Carwow Leasing

New BMW 420 M Sport 184 HP (135 kW) 2026 Coupe

(2026) BMW 420 M Sport 184 HP

Fair price

MK150DQ Milton Keynes, Buckinghamshire

153 g CO2/km comb. - 184 HP (135 kW) - 6.6 Mpg

Carwow Leasing

New BMW 420 M Sport 184 HP (135 kW) 2026 Coupe

(2026) BMW 420 M Sport 184 HP

Fair price

You save £1,086

PE21 7PQ Lincolnshire, Lincolnshire

144 g CO2/km comb. - 184 HP (135 kW) - 6.3 Mpg

Carwow Leasing

New BMW 420 M Sport 184 HP (135 kW) 2026 Coupe

(2026) BMW 420 M Sport 184 HP

Fair price

Estimated price £48,610

PE21 7PQ Lincolnshire, Lincolnshire

153 g CO2/km comb. - 184 HP (135 kW) - 6.6 Mpg

Showing 1 - 25 of 694 results

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