2025 BMW 420 • Compare 149 used cars with valuation

Market overview: April-2026 Price Analysis: A used BMW 420 from 2025 currently costs between £34,150 and £48,556. On average, the mileage for this year stands at 7,076 miles. The depreciation and price trend over the last 12 months is £5,340.

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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 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 Leasing

2025

(2025) BMW 420 M Sport 184 HP

£49,100

Fair price

You save £300

RH10 1TN West Sussex, West Sussex

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

Price checked by AutoUncle

Super price

Good price

Fair price

A bit pricey

Expensive

-6%

1 / 3

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

4 Series i M Sport 5dr Step Auto

2025
2,963 miles
Trim level: M Sport
2.0L Petrol
Hatchback
Automatic
184 HP (135 kW)
CO2 emissions: 153 g CO2/km comb.
mpg: 42
Details

Good price

£37,359

£40,087

TS18 3RB, Durham

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Availability verified

-3%

1 / 4

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

- 4 Series Convertible i M Sport

2025
36,531 miles
Trim level: M Sport
2.0L Petrol
Cabriolet
Automatic
184 HP (135 kW)
CO2 emissions: 154 g CO2/km comb.
mpg: 6.8
Details

Super price

£29,300

£30,500

CM1 3BH Essex, Essex

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Availability verified

1 / 1

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

- 4 Series Gran Coupe i M Sport

2025
10 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

Good price

£46,286

£46,094

RH10 1TN West Sussex, West Sussex

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Availability verified

1 / 1

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

- 4 Series Gran Coupe i M Sport

2025
10 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

Super price

£45,514

£45,312

RH10 1TN West Sussex, West Sussex

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Verified Dealers

Carwow Leasing

2026

(2026) BMW 420 M Sport 184 HP

£46,500

Good price

You save £3,400

S92RQ

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

Carwow Leasing

2026

(2026) BMW 420 M Sport 184 HP

£45,895

Good price

You save £3,505

LS12 6EG West Yorkshire, West Yorkshire

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

Carwow Leasing

2025

(2025) BMW 420 M Sport 184 HP

£45,514

Super price

You save £3,886

RH10 1TN West Sussex, West Sussex

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

Carwow Leasing

2025

(2025) BMW 420 M Sport 184 HP

£46,286

Good price

You save £3,114

RH10 1TN West Sussex, West Sussex

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

-7%

1 / 4

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

4 Series i M Sport Coupe 2.0

2025
3,000 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 146 g CO2/km comb.
mpg: 44.1
Details

Super price

£35,890

£38,990

CT2 7PX Kent, Kent

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Availability verified

-2%

1 / 4

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

4 Series Gran Coupe i M Sport 5dr

Apr 2025
10,136 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 153 g CO2/km comb.
Details

Super price

£37,000

£37,850

Dealer

WC1E 7DP Greater London, London

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-3%

1 / 4

Used (2025) BMW 420 M Sport | Super price

4 Series i M Sport Gran Coupe M

2025
5,324 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
Details

Super price

£34,150

£35,450

Exchange and Mart

West Yorkshire, West Yorkshire

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-2%

1 / 4

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

4 Series SERIES i M Sport 5dr Step

2025
5,165 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
Details

Super price

£36,192

£36,999

Dealer

DN35 Grimsby, Lincolnshire

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-11%

1 / 4

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

4 Series i M Sport Coupe 2.0

Sep 2025
7,947 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 144 g CO2/km comb.
mpg: 44.1
Details

Good price

£37,600

£42,595

Dealer

WC1E 7DP Greater London, London

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-22%

1 / 4

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

4 Series i M Sport 5dr Step Auto -

Apr 2025
9,417 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 144 g CO2/km comb.
mpg: 42.2
Details

Super price

£35,045

£44,995

Buyacar

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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

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

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

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

-10%

1 / 3

Used (2025) BMW 420 M Sport 180 HP | Good price

4 Series Gran Coupe i M Sport 5dr

2025
4,462 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
180 HP (132 kW)
Details

Good price

£37,983

£42,662

Buyacar

Delivered to you

View the car

-6%

1 / 4

Used (2025) BMW 420 M Sport 180 HP | Super price

4 Series Gran Coupe i M Sport 5dr

2025
2,963 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
180 HP (132 kW)
Details

Super price

£37,359

£40,087

Honestjohn

WC1E 7DP Greater London, London

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-8%

1 / 4

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

4 Series SERIES i M Sport 2dr Step

2025
5,037 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 146 g CO2/km comb.
mpg: 44.1
Details

Good price

£36,750

£40,000

Honestjohn

WC1E 7DP Greater London, London

View the car

-1%

1 / 4

Used (2025) BMW 420 M Sport 181 HP | Good price

4 Series i M Sport Coupe 2.0

2025
7,633 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
181 HP (133 kW)
CO2 emissions: 147 g CO2/km comb.
mpg: 44.1
Details

Good price

£36,136

£36,636

Bmw.co.uk

PE4 5HW Peterborough, Cambridgeshire

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-6%

1 / 4

Used (2025) BMW 420 M Sport 181 HP | Super price

4 Series i M Sport Coupe 2.0

2025
6,307 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
181 HP (133 kW)
CO2 emissions: 146 g CO2/km comb.
mpg: 44.1
Details

Super price

£35,399

£37,999

Motors.co.uk

PR8 5JF Scarisbrick, Lancashire

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-5%

1 / 4

Used (2025) BMW 420 M Sport 181 HP | Good price

4 Series i M Sport Coupe 2.0

2025
5,958 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
181 HP (133 kW)
CO2 emissions: 147 g CO2/km comb.
mpg: 44.1
Details

Good price

£36,695

£38,995

Bmw.co.uk

EH15 1EB Edinburgh, Edinburgh

View the car

-2%

1 / 4

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

4 Series SERIES i M Sport 5dr Step

2025
5,918 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
Details

Good price

£35,898

£36,998

Honestjohn

NG5 1HZ Basford, Nottinghamshire

View the car

-5%

1 / 4

Used (2025) BMW 420 M Sport 181 HP | Super price

4 Series i M Sport Coupe 2.0

2025
6,173 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
181 HP (133 kW)
CO2 emissions: 159 g CO2/km comb.
mpg: 40.4
Details

Super price

£34,995

£36,995

Bmw.co.uk

EH15 1EB Edinburgh, Edinburgh

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1 / 4

Used (2025) BMW 420 M Sport 180 HP | Good price

4 Series Gran Coupe i M Sport 5dr

2025
7,193 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
180 HP (132 kW)
Details

Good price

£37,500

Honestjohn

WC1E 7DP Greater London, London

View the car

-21%

1 / 4

Used (2025) BMW 420 M Sport 181 HP | Good price

4 Series i M Sport Coupe 2.0

2025
20,774 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
181 HP (133 kW)
CO2 emissions: 146 g CO2/km comb.
mpg: 44.1
Details

Good price

£35,000

£44,500

Bmw.co.uk

NG7 2AX Nottingham, Nottinghamshire

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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

2026

(2026) BMW 420 M Sport 184 HP

£47,511

Good price

You save £1,889

LS12 6EG West Yorkshire, West Yorkshire

155 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 Leasing

2026

(2026) BMW 420 M Sport 184 HP

£47,263

Good price

You save £2,137

LS12 6EG West Yorkshire, West Yorkshire

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

-17%

1 / 4

Used (2025) BMW 420 M Sport 181 HP | Super price

4 Series Gran Coupe i M Sport 5dr

2025
13,211 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
181 HP (133 kW)
Details

Super price

£34,500

£41,995

Buyacar

Delivered to you

View the car

-11%

1 / 4

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

4 Series Gran Coupe i M Sport 5dr

Feb 2025
4,135 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 153 g CO2/km comb.
Details

Super price

£37,995

£42,995

Honestjohn

WC1E 7DP Greater London, London

View the car

-12%

1 / 4

Used (2025) BMW 420 M Sport 181 HP | Super price

4 Series Gran Coupe i M Sport 5dr

2025
13,358 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
181 HP (133 kW)
Details

Super price

£33,995

£38,995

Honestjohn

WC1E 7DP Greater London, London

View the car

-7%

1 / 4

Used (2025) BMW 420 M Sport 180 HP | Super price

4 Series Gran Coupe i M Sport 5dr

2025
9,656 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
180 HP (132 kW)
Details

Super price

£35,995

£38,995

Honestjohn

WC1E 7DP Greater London, London

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1 / 4

Used (2025) BMW 420 M Sport 181 HP | Good price

4 Series i M Sport Coupe 2.0

2025
2,516 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
181 HP (133 kW)
CO2 emissions: 146 g CO2/km comb.
mpg: 44.1
Details

Good price

£36,990

Bmw.co.uk

S41 9BU Derbyshire, Derbyshire

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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

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

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

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

Showing 1 - 25 of 151 results

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BMW 420 (1000+)