2021 BMW 420 • Compare 131 used cars with valuation

Market overview: April-2026 Price Analysis: A used BMW 420 from 2021 currently costs between £15,189 and £28,790. On average, the mileage for this year stands at 43,036 miles. The depreciation and price trend over the last 12 months is -£880.

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Carwow

2023

(2023) BMW 420 M Sport 184 HP

£28,899

Fair price

You save £501

CW7 Cheshire West And Chester, Cheshire

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

Carwow

2022

(2022) BMW 420 M Sport 190 HP

£25,100

Fair price

You save £300

WD3 3RT Croxley Green, Hertfordshire

130 g CO2/km comb. - 190 HP (139 kW) - 5.0 Mpg

Carwow

2022

(2022) BMW 420 M Sport 184 HP

£24,421

Fair price

You save £879

YO304WR, North Yorkshire

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

Carwow

2023

(2023) BMW 420 M Sport 184 HP

£29,692

Fair price

Estimated price £28,555

SO53 3YU Cross Rise, Hampshire

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

Price checked by AutoUncle

Super price

Good price

Fair price

A bit pricey

Expensive

-7%

1 / 4

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

- 4 Series Gran Coupe i xDrive

2021
49,900 miles
Trim level: Sport Line
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 182 g CO2/km comb.
mpg: 7.8
Details

Super price

£12,899

£13,999

CW7 Cheshire West And Chester, Cheshire

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-4%

1 / 4

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

- 4 Series Gran Coupe i M Sport

2021
48,250 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 169 g CO2/km comb.
mpg: 7.3
Details

Super price

£16,290

£16,995

W1H7AB

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1 / 2

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

- 4 Series Gran Coupe i M Sport

2021
70,340 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 169 g CO2/km comb.
mpg: 7.3
Details

Super price

£13,295

LE10 3DJ Leicestershire, Leicestershire

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1 / 3

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

- 4 Series Gran Coupe i M Sport

2021
61,548 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 169 g CO2/km comb.
mpg: 7.3
Details

Super price

£15,189

SO31 7FL Lower Swanwick, Hampshire

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Carwow

2023

(2023) BMW 420 M Sport 184 HP

£22,990

Fair price

You save £310

DL1 2LD Darlington, Durham

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

Carwow

2023

(2023) BMW 420 M Sport 184 HP

£28,993

Fair price

Estimated price £28,719

SO53 3YU Cross Rise, Hampshire

151 g CO2/km comb. - 184 HP (135 kW) - 42.8 Mpg

Carwow

2021

(2021) BMW 420 M Sport 190 HP

£24,899

Fair price

Estimated price £23,654

E4 7PX Greater London, London

128 g CO2/km comb. - 190 HP (139 kW) - 4.8 Mpg

Carwow

2023

(2023) BMW 420 M Sport 184 HP

£23,899

Super price

You save £2,701

DE21 6BZ Derby, Derbyshire

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

1 / 3

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

4 Series i M Sport 5dr Auto

2021
66,100 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 169 g CO2/km comb.
mpg: 7.3
Details

Super price

£15,624

PO2 9QZ Hilsea, Hampshire

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-3%

1 / 3

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

- 4 Series Gran Coupe i xDrive M

2021
73,833 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 178 g CO2/km comb.
mpg: 7.8
Details

Good price

£15,806

£16,375

E65LU

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Availability verified

-4%

1 / 3

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

- 4 Series Gran Coupe i xDrive M

2021
48,021 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 178 g CO2/km comb.
mpg: 7.8
Details

Good price

£18,433

£19,292

E65LU

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1 / 3

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

- 4 Series Gran Coupe i M Sport

2021
47,307 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 169 g CO2/km comb.
mpg: 7.3
Details

Super price

£15,550

WD3 3RT Croxley Green, Hertfordshire

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

- 4 Series Gran Coupe i M Sport

2021
29,075 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 169 g CO2/km comb.
mpg: 7.3
Details

Super price

£17,900

WD3 3RT Croxley Green, Hertfordshire

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1 / 4

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

- 4 Series Gran Coupe i M Sport

2021
36,933 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 169 g CO2/km comb.
mpg: 7.3
Details

Super price

£18,490

EN92BL

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Carwow

2023

(2023) BMW 420 M Sport 184 HP

£25,249

Super price

You save £2,851

E4 7PX Greater London, London

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

Carwow

2020

(2020) BMW 420 M Sport 190 HP

£21,750

Fair price

You save £50

CM23 3LJ Hertfordshire, Hertfordshire

156 g CO2/km comb. - 190 HP (139 kW) - 5.9 Mpg

Carwow

2022

(2022) BMW 420 M Sport 190 HP

£27,961

Fair price

Estimated price £27,216

LE12 7AT Mountsorrel, Leicestershire

122 g CO2/km comb. - 190 HP (139 kW) - 4.7 Mpg

Carwow

2022

(2022) BMW 420 Comfort Edition 190 HP

£23,799

Good price

You save £2,401

CW7 Cheshire West And Chester, Cheshire

129 g CO2/km comb. - 190 HP (139 kW) - 4.9 Mpg

-2%

1 / 1

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

- 4 Series Gran Coupe i M Sport

2021
49,156 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 169 g CO2/km comb.
mpg: 7.3
Details

Super price

£16,100

£16,500

RM20 3NL Purfleet-On-Thames, Essex

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1 / 3

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

- 4 Series Gran Coupe i xDrive M

2021
31,174 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 178 g CO2/km comb.
mpg: 7.8
Details

Super price

£17,650

£17,500

WD3 3RT Croxley Green, Hertfordshire

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1 / 4

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

- 4 Series Gran Coupe i M Sport

2021
71,060 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 169 g CO2/km comb.
mpg: 7.3
Details

Super price

£13,995

OL10 4HQ Greater Manchester, Manchester

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1 / 3

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

4 Series Gran Coupe 2.0 i GPF M

2021
39,999 miles
Trim level: M Sport
2.0L Petrol
Coupe
Manual
184 HP (135 kW)
Details

Good price

£17,965

Motors.co.uk

FY1 5JP Blackpool, Lancashire

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-31%

1 / 3

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

4 Series i M Sport 5dr Auto

2021
42,000 miles
Trim level: M Sport
2.0L Petrol
Sedan
Automatic
184 HP (135 kW)
CO2 emissions: 135 g CO2/km comb.
mpg: 46
Details

Good price

£22,650

£32,995

Motors.co.uk

B78 1HA Polesworth, Warwickshire

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1 / 4

Used (2021) BMW 420 M Sport | Good price

4 Series d MHT M Sport 2dr Step

2021
53,300 miles
Trim level: M Sport
2.0L Diesel
Coupe
Automatic
Details

Good price

£23,499

Motors.co.uk

TN12 5HD East Peckham, Kent

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-41%

1 / 4

Used (2021) BMW 420 M Sport 187 HP | Good price

4 Series d M Sport Convertible

2021
13,368 miles
Trim level: M Sport
2.0L Diesel
Cabriolet
Automatic
187 HP (137 kW)
CO2 emissions: 129 g CO2/km comb.
mpg: 57.6
Details

Good price

£27,625

£46,988

Bmw.co.uk

CR0 4PB Beddington, London

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-41%

1 / 4

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

d M Sport Coupe

2021
35,151 miles
Trim level: M Sport
2.0L Diesel
Coupe
Automatic
190 HP (139 kW)
CO2 emissions: 151 g CO2/km comb.
mpg: 49.6
Details

Super price

£20,995

£35,950

Bmw.co.uk

BT63 Armagh City, Banbridge And Craigavon

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1 / 2

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

4 Series Gran Coupe 2.0 i GPF M

2021
19,638 miles
Trim level: M Sport
2.0L Petrol
Coupe
Manual
184 HP (135 kW)
Details

Good price

£19,895

£19,495

Motors.co.uk

LA3 3FB Lancashire, Lancashire

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1 / 4

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

4 Series d MHT M Sport 2dr Step

2021
48,000 miles
Trim level: M Sport
2.0L Diesel
Coupe
Automatic
190 HP (139 kW)
Details

Good price

£19,995

Motors.co.uk

SO50 7HD Fair Oak, Hampshire

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Carwow

2023

(2023) BMW 420 M Sport 192 HP

£33,139

Good price

You save £1,961

NE36 0BQ West Boldon, Tyne And Wear

159 g CO2/km comb. - 192 HP (141 kW) - 40.4 Mpg

Carwow

2020

(2020) BMW 420 M Sport 190 HP

£19,999

Fair price

You save £201

EH151BT

149 g CO2/km comb. - 190 HP (139 kW) - 5.7 Mpg

Carwow

2020

(2020) BMW 420 M Sport 184 HP

£17,890

Fair price

Estimated price £17,466

NE8 3HL Tyne And Wear, Tyne And Wear

170 g CO2/km comb. - 184 HP (135 kW) - 7.4 Mpg

Carwow

2021

(2021) BMW 420 M Sport 184 HP

£18,490

Super price

You save £2,610

EN92BL

169 g CO2/km comb. - 184 HP (135 kW) - 7.3 Mpg

New

1 / 4

Used (2021) BMW 420 M Sport | Super price

4 Series i M Sport 2dr Step

2021
54,600 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
Details

Super price

£19,490

Motors.co.uk

UB11 1FW Hayes, London

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-12%

1 / 4

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

4 Series d MHT M Sport Pro Edition

2021
35,005 miles
Trim level: M Sport
2.0L Diesel
Coupe
Automatic
190 HP (139 kW)
CO2 emissions: 128 g CO2/km comb.
mpg: 4.8
Details

Fair price

£24,899

£28,299

E4 7PX Greater London, London

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Availability verified

-8%

1 / 4

Used (2021) BMW 420 M Sport 181 HP | Fair price

4 Series i M Sport Coupe 2.0

2021
17,100 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
181 HP (133 kW)
CO2 emissions: 151 g CO2/km comb.
mpg: 42.2
Details

Fair price

£26,950

£29,600

Bmw.co.uk

HG3 1LG Pannal, North Yorkshire

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-2%

1 / 4

Used (2021) BMW 420 M Sport | Fair price

4 Series i M Sport 2dr Step

2021
26,113 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
Details

Fair price

£24,249

£24,749

Motors.co.uk

M12 6LP Greater Manchester, Manchester

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1 / 4

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

4 Series Convertible i M Sport 2dr

Jul 2021
22,860 miles
Trim level: M Sport
2.0L Petrol
Cabriolet
Automatic
184 HP (135 kW)
CO2 emissions: 154 g CO2/km comb.
Details

Fair price

£28,950

£27,990

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Carwow

2021

(2021) BMW 420 M Sport 184 HP

£18,433

Good price

You save £1,767

E65LU

178 g CO2/km comb. - 184 HP (135 kW) - 7.8 Mpg

Carwow

2020

(2020) BMW 420 M Sport 184 HP

£18,699

Fair price

You save £101

CV4 9DU West Midlands, West Midlands

170 g CO2/km comb. - 184 HP (135 kW) - 7.4 Mpg

Carwow

2019

(2019) BMW 420 Sport Line 190 HP

£16,490

Fair price

You save £610

NE8 3HL Tyne And Wear, Tyne And Wear

156 g CO2/km comb. - 190 HP (139 kW) - 5.8 Mpg

Carwow

2020

(2020) BMW 420 M Sport 184 HP

£15,999

Super price

You save £3,201

SO150LP, Hampshire

182 g CO2/km comb. - 184 HP (135 kW) - 8.0 Mpg

Showing 1 - 25 of 129 results

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Good price

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BMW 420 (1000+)