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2026 BMW 420 • Compare 84 used cars with valuation

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Carwow

2025

(2025) BMW 420 M Sport 184 HP

£37,359

Good price

You save £1,841

TS18 3RB, Durham

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

Carwow Leasing

2026

(2026) BMW 420 M Sport 184 HP

£47,376

Good price

You save £2,024

IP31 1SX Fornham Saint Martin, Suffolk

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

Carwow Leasing

2025

(2025) BMW 420 M Sport 184 HP

£46,336

Good price

You save £3,064

RH10 1TN West Sussex, West Sussex

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

Carwow Leasing

2026

(2026) BMW 420 M Sport 184 HP

£44,277

Super price

You save £5,123

W1K 7TT Greater London, London

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

-5%

1 / 4

Used (2026) BMW 420 M Sport 184 HP

- 4 Series Gran Coupe i M Sport

2026
13,071 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 153 g CO2/km comb.
mpg: 6.6
Details

£28,849

£30,449

Not evaluated

B6 5SU West Midlands, West Midlands

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Availability verified

-5%

1 / 4

Used (2026) BMW 420 M Sport 184 HP

- 4 Series Gran Coupe i M Sport

2026
25,916 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 153 g CO2/km comb.
mpg: 6.6
Details

£27,349

£28,999

Not evaluated

BB12 6EH Lancashire, Lancashire

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Availability verified

-2%

1 / 4

Used (2026) BMW 420 M Sport 184 HP

- 4 Series Gran Coupe i M Sport

2026
23,446 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 153 g CO2/km comb.
mpg: 6.6
Details

£28,449

£29,249

Not evaluated

E4 7PX Greater London, London

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Availability verified

1 / 4

Used (2026) BMW 420 M Sport 184 HP

- 4 Series Gran Coupe i M Sport

2026
17,275 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 153 g CO2/km comb.
mpg: 6.6
Details

£29,553

£29,761

Not evaluated

DH11HP

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Availability verified

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Carwow

2026

(2026) BMW 420 M Sport 184 HP

£37,983

Good price

You save £3,217

PO35FF

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

Carwow Leasing

2025

(2025) BMW 420 M Sport 184 HP

£48,357

Fair price

You save £1,043

OX28JP Oxfordshire, Oxfordshire

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

Carwow Leasing

2026

(2026) BMW 420 M Sport 184 HP

£47,500

Good price

You save £2,400

S92RQ

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

Carwow

2026

(2026) BMW 420 M Sport 184 HP

£38,490

Fair price

You save £810

SO53 3YU Cross Rise, Hampshire

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

-5%

1 / 4

Used (2026) BMW 420 M Sport 184 HP

- 4 Series Gran Coupe i M Sport

2026
31,255 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 153 g CO2/km comb.
mpg: 6.6
Details

£28,997

£30,610

Not evaluated

TA66DD

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Availability verified

1 / 4

Used (2026) BMW 420 M Sport 184 HP

- 4 Series Gran Coupe i M Sport

2026
26,320 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 153 g CO2/km comb.
mpg: 6.6
Details

£25,766

£25,495

Not evaluated

DL11XP

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Availability verified

-6%

1 / 4

Used (2026) BMW 420 M Sport 184 HP

- 4 Series Gran Coupe i M Sport

2026
50,399 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 153 g CO2/km comb.
mpg: 6.6
Details

£23,500

£25,100

Not evaluated

ME59QG

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Availability verified

-3%

1 / 4

Used (2026) BMW 420 M Sport 184 HP

- 4 Series i M Sport 2dr Step

2026
31,609 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 144 g CO2/km comb.
mpg: 6.3
Details

£24,299

£25,199

Not evaluated

EH151BT

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Availability verified

1 / 4

Used (2026) BMW 420 M Sport 184 HP

- 4 Series i M Sport 2dr Step

2026
50,455 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 144 g CO2/km comb.
mpg: 6.3
Details

£22,866

£22,786

Not evaluated

NE360BQ

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Availability verified

-4%

1 / 4

Used (2026) BMW 420 M Sport 184 HP

- 4 Series i M Sport 2dr Step

2026
20,868 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 144 g CO2/km comb.
mpg: 6.3
Details

£25,899

£26,999

Not evaluated

G329QA

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Carwow

2026

(2026) BMW 420 M Sport 184 HP

£37,890

Good price

You save £2,810

CT27PX

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

Carwow Leasing

2025

(2025) BMW 420 M Sport 184 HP

£45,564

Super price

You save £3,836

RH10 1TN West Sussex, West Sussex

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

Carwow Leasing

2026

(2026) BMW 420 M Sport 184 HP

£48,141

Fair price

You save £1,259

MK150DQ Milton Keynes, Buckinghamshire

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

Carwow

2025

(2025) BMW 420 M Sport 184 HP

£36,990

Fair price

Estimated price £36,896

SO53 3YU Cross Rise, Hampshire

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

-3%

1 / 4

Used (2026) BMW 420 M Sport 184 HP

- 4 Series i M Sport 2dr Step

2026
30,526 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 144 g CO2/km comb.
mpg: 6.3
Details

£27,249

£28,299

Not evaluated

B6 5SU West Midlands, West Midlands

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Availability verified

-3%

1 / 4

Used (2026) BMW 420 M Sport 184 HP

- 4 Series i M Sport 2dr Step

2026
26,113 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 144 g CO2/km comb.
mpg: 6.3
Details

£23,949

£24,749

Not evaluated

M126LP

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Availability verified

-13%

1 / 4

Used (2026) BMW 420 M Sport 184 HP

- 4 Series i M Sport 2dr Step

2026
30,951 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 144 g CO2/km comb.
mpg: 6.3
Details

£23,499

£27,199

Not evaluated

PO2 9RN Hilsea, Hampshire

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Availability verified

-7%

1 / 4

Used (2026) BMW 420 M Sport 184 HP

- 4 Series i M Sport 2dr Step

2026
24,499 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 144 g CO2/km comb.
mpg: 6.3
Details

£23,599

£25,549

Not evaluated

G32 9QA Glasgow City, Glasgow

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Availability verified

-4%

1 / 3

Used (2026) BMW 420 M Sport 184 HP

- 4 Series Gran Coupe i M Sport

2026
74,811 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 153 g CO2/km comb.
mpg: 6.6
Details

£21,750

£22,800

Not evaluated

N11 1GN Greater London, London

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Availability verified

-1%

1 / 4

Used (2026) BMW 420 M Sport 184 HP

- 4 Series Gran Coupe i M Sport

2026
31,890 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 153 g CO2/km comb.
mpg: 6.6
Details

£27,196

£27,720

Not evaluated

YO304WR, North Yorkshire

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Availability verified

-3%

1 / 3

Used (2026) BMW 420 M Sport 184 HP

- 4 Series i M Sport 2dr Step

2026
40,750 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 144 g CO2/km comb.
mpg: 6.3
Details

£25,495

£26,395

Not evaluated

BL13DE

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Availability verified

-2%

1 / 4

Used (2026) BMW 420 M Sport 184 HP

- 4 Series i M Sport 2dr Step

2026
15,684 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 144 g CO2/km comb.
mpg: 6.3
Details

£28,799

£29,499

Not evaluated

DE21 6BZ Derby, Derbyshire

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Availability verified

1 / 4

Used (2026) BMW 420 M Sport 184 HP

- 4 Series i M Sport 2dr Step

2026
22,590 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 144 g CO2/km comb.
mpg: 6.3
Details

£28,475

£28,599

Not evaluated

PE201JH

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Availability verified

-1%

1 / 4

Used (2026) BMW 420 M Sport 184 HP

- 4 Series i M Sport 2dr Step

2026
25,937 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 144 g CO2/km comb.
mpg: 6.3
Details

£29,491

£29,990

Not evaluated

SO533YU

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Carwow

2025

(2025) BMW 420 M Sport 184 HP

£35,890

Super price

You save £3,410

CT2 7PX Kent, Kent

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

Carwow

2026

(2026) BMW 420 M Sport 184 HP

£37,490

Good price

You save £3,110

SO533YU

154 g CO2/km comb. - 184 HP (135 kW) - 6.8 Mpg

Carwow Leasing

2026

(2026) BMW 420 M Sport 184 HP

£45,950

Good price

You save £3,450

SY14AQ

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

Carwow Leasing

2025

(2025) BMW 420 M Sport 184 HP

£49,150

Fair price

You save £250

RH10 1TN West Sussex, West Sussex

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

1 / 1

New (2026) BMW 420 M Sport 184 HP

- 4 Series Gran Coupe i M Sport

2026
0 miles
Trim level: M Sport
Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 155 g CO2/km comb.
mpg: 6.6
Details

£52,843

Not evaluated

DE21 Derby, Derbyshire

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Availability verified

-2%

1 / 1

New (2026) BMW 420 M Sport 184 HP

- 4 Series i M Sport 2dr Step

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

£46,500

£47,500

Not evaluated

S92RQ

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Availability verified

1 / 3

Used (2026) BMW 420 M Sport 184 HP

- 4 Series i M Sport 2dr Step

2026
42,209 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 144 g CO2/km comb.
mpg: 6.3
Details

£23,987

Not evaluated

BL2 2BL Greater Manchester, Manchester

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Availability verified

1 / 4

Used (2026) BMW 420 M Sport 184 HP

- 4 Series Gran Coupe i M Sport

2026
20,017 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 153 g CO2/km comb.
mpg: 6.6
Details

£30,750

Not evaluated

CM1 3BH Essex, Essex

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Availability verified

1 / 1

New (2026) BMW 420 M Sport 184 HP

- 4 Series Gran Coupe i M Sport

2026
0 miles
Trim level: M Sport
Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 155 g CO2/km comb.
mpg: 6.6
Details

£47,263

Not evaluated

TN2 3UE Kent, Kent

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Availability verified

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Carwow Leasing

2026

(2026) BMW 420 M Sport 184 HP

£52,846

Fair price

You save £1,554

W1K 7TT Greater London, London

154 g CO2/km comb. - 184 HP (135 kW) - 6.8 Mpg

Carwow

2025

(2025) BMW 420 M Sport 184 HP

£29,300

Super price

You save £5,200

CM1 3BH Essex, Essex

154 g CO2/km comb. - 184 HP (135 kW) - 6.8 Mpg

Carwow Leasing

2026

(2026) BMW 420 M Sport 184 HP

£49,839

Fair price

You save £61

LU48QN

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

Carwow Leasing

2026

(2026) BMW 220 M Sport 170 HP

£37,375

Fair price

Estimated price £36,267

S92RQ

120 g CO2/km comb. - 170 HP (125 kW) - 5.2 Mpg

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