2026 BMW 420 • Compare 76 used cars with valuation

Market overview: April-2026 Price Analysis: A used BMW 420 from 2026 currently costs between £23,990 and £87,623. On average, the mileage for this year stands at 15,834 miles. The depreciation and price trend over the last 12 months is -£380.

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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

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

Carwow

2025

(2025) BMW 420 M Sport 184 HP

£37,657

Fair price

You save £1,543

TS18 3RB, Durham

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

Price checked by AutoUncle

Super price

Good price

Fair price

A bit pricey

Expensive

-6%

1 / 4

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

4 Series i M Sport 2dr Step

2026
3,243 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
Details

Good price

£39,990

£42,990

Buyacar

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-1%

1 / 4

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

4 Series i M Sport 5dr Step Auto -

Feb 2026
1,274 miles
Trim level: M Sport
2.0L Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 153 g CO2/km comb.
Details

Fair price

£38,495

£39,220

Buyacar

Delivered to you

View the car

-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
Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 153 g CO2/km comb.
mpg: 6.6
Details

£27,333

£27,720

Not evaluated

YO304WR, North Yorkshire

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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
Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 153 g CO2/km comb.
mpg: 6.6
Details

£26,325

£25,495

Not evaluated

DL11XP

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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

2025

(2025) BMW 420 M Sport 184 HP

£29,150

Super price

You save £5,350

CM1 3BH Essex, Essex

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

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

-3%

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
Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 153 g CO2/km comb.
mpg: 6.6
Details

£22,050

£22,800

Not evaluated

N11 1GN Greater London, London

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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
Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 153 g CO2/km comb.
mpg: 6.6
Details

£29,924

£29,761

Not evaluated

DH11HP

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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
9,441 miles
Trim level: M Sport
Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 144 g CO2/km comb.
mpg: 6.3
Details

£29,873

£30,794

Not evaluated

NE360BQ

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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
Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 144 g CO2/km comb.
mpg: 6.3
Details

£22,993

£22,786

Not evaluated

NE360BQ

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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

£46,950

Not evaluated

S92RQ

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-3%

1 / 4

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

£55,000

£56,750

Not evaluated

S92RQ

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Carwow Leasing

2025

(2025) Audi A5 S-Line 150 HP

£42,555

Super price

You save £3,545

LS11 5LN West Yorkshire, West Yorkshire

154 g CO2/km comb. - 150 HP (110 kW) - 6.8 Mpg

Carwow Leasing

2026

(2026) Audi A5 Black Edition 150 HP

£47,500

Fair price

You save £100

BH124QN

156 g CO2/km comb. - 150 HP (110 kW) - 6.8 Mpg

Carwow Leasing

2025

(2025) Audi A5 S-Line 150 HP

£43,000

Super price

You save £4,000

DE24 8AJ Derby, Derbyshire

154 g CO2/km comb. - 150 HP (110 kW) - 6.9 Mpg

Carwow Leasing

2026

(2026) Audi A5 S-Line 150 HP

£44,500

Fair price

You save £1,600

BH124QN

154 g CO2/km comb. - 150 HP (110 kW) - 6.8 Mpg

1 / 4

Used (2026) BMW 420 M Sport 184 HP

- 4 Series Convertible i M Sport

2026
5,799 miles
Trim level: M Sport
Petrol
Cabriolet
Automatic
184 HP (135 kW)
CO2 emissions: 154 g CO2/km comb.
mpg: 6.8
Details

£44,722

£44,995

Not evaluated

TS183RB

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-11%

1 / 4

Used (2026) BMW 420 M Sport 184 HP

- 4 Series i M Sport 2dr Step

2026
30,943 miles
Trim level: M Sport
Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 144 g CO2/km comb.
mpg: 6.3
Details

£24,099

£27,199

Not evaluated

PO2 9RN Hilsea, Hampshire

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-6%

1 / 4

Used (2026) BMW 420 M Sport 184 HP

- 4 Series Gran Coupe i M Sport

2026
4,462 miles
Trim level: M Sport
Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 153 g CO2/km comb.
mpg: 6.6
Details

£39,994

£42,662

Not evaluated

PO35FF

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Availability verified

-5%

1 / 4

Used (2026) BMW 420 M Sport 184 HP

- 4 Series i M Sport 2dr Step

2026
38,986 miles
Trim level: M Sport
Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 144 g CO2/km comb.
mpg: 6.3
Details

£25,649

£27,249

Not evaluated

G329QA

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Availability verified

-3%

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
Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 153 g CO2/km comb.
mpg: 6.6
Details

£29,493

£30,610

Not evaluated

TA66DD

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New

1 / 4

Used (2026) BMW 420 M Sport 184 HP

- 4 Series Gran Coupe i M Sport

2026
23,673 miles
Trim level: M Sport
Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 153 g CO2/km comb.
mpg: 6.6
Details

£28,995

Not evaluated

EX28FD

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Availability verified

-19%

1 / 4

Used (2026) BMW 420 M Sport 184 HP

- 4 Series i M Sport 2dr Step

2026
6,620 miles
Trim level: M Sport
Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 144 g CO2/km comb.
mpg: 6.3
Details

£37,990

£47,000

Not evaluated

CT27PX

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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
Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 144 g CO2/km comb.
mpg: 6.3
Details

£23,987

Not evaluated

BD2 1DS West Yorkshire, West Yorkshire

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1 / 1

New (2026) BMW 420 M Sport 184 HP

- 4 Series Convertible i M Sport

2026
10 miles
Trim level: M Sport
Petrol
Cabriolet
Automatic
184 HP (135 kW)
CO2 emissions: 154 g CO2/km comb.
mpg: 6.8
Details

£56,431

£56,550

Not evaluated

RH101TN

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1 / 1

New (2026) BMW 420 M Sport 184 HP

- 4 Series Convertible i M Sport

2026
10 miles
Trim level: M Sport
Petrol
Cabriolet
Automatic
184 HP (135 kW)
CO2 emissions: 154 g CO2/km comb.
mpg: 6.8
Details

£53,707

£53,820

Not evaluated

RH101TN

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Carwow

2025

(2025) Audi A5 S-Line 150 HP

£32,850

Super price

You save £3,650

CM1 3BH Essex, Essex

153 g CO2/km comb. - 150 HP (110 kW) - 6.9 Mpg

Carwow

2026

(2026) Audi A5 S-Line 150 HP

£38,290

Fair price

You save £310

PO35FH

154 g CO2/km comb. - 150 HP (110 kW) - 6.8 Mpg

Carwow Leasing

2026

(2026) Audi A5 S-Line 204 HP

£47,425

Good price

You save £2,475

PO35FH Portsmouth, Hampshire

128 g CO2/km comb. - 204 HP (150 kW) - 4.9 Mpg

Carwow Leasing

2026

(2026) BMW 220 M Sport 184 HP

£41,117

Fair price

Estimated price £39,595

PE21 7PQ Lincolnshire, Lincolnshire

146 g CO2/km comb. - 184 HP (135 kW) - 6.4 Mpg

-1%

New (2026) BMW 420 M Sport 184 HP

- 4 Series Gran Coupe i M Sport

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

£51,030

£51,706

Not evaluated

RH1 5EG Salfords, Surrey

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1 / 4

Used (2026) BMW 420 M Sport 184 HP

- 4 Series i M Sport 2dr Step

2026
31,605 miles
Trim level: M Sport
Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 144 g CO2/km comb.
mpg: 6.3
Details

£25,199

Not evaluated

EH151BT

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-1%

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
Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 144 g CO2/km comb.
mpg: 6.3
Details

£28,949

£29,499

Not evaluated

DE21 6BZ Derby, Derbyshire

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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
30,525 miles
Trim level: M Sport
Petrol
Coupe
Automatic
184 HP (135 kW)
CO2 emissions: 144 g CO2/km comb.
mpg: 6.3
Details

£27,399

£28,299

Not evaluated

B6 5SU West Midlands, West Midlands

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

£26,549

£26,999

Not evaluated

G329QA

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Carwow

2025

(2025) BMW 220 M Sport 184 HP

£33,384

Fair price

You save £316

WC1E 7DP Greater London, London

146 g CO2/km comb. - 184 HP (135 kW) - 44.0 Mpg

Carwow Leasing

2026

(2026) Audi A5 S-Line 150 HP

£42,610

Super price

You save £3,490

PO35FH Portsmouth, Hampshire

154 g CO2/km comb. - 150 HP (110 kW) - 6.8 Mpg

Carwow Leasing

2025

(2025) BMW 220 M Sport 184 HP

£39,726

Fair price

Estimated price £39,595

OX28JP Oxfordshire, Oxfordshire

146 g CO2/km comb. - 184 HP (135 kW) - 6.4 Mpg

Carwow Leasing

2026

(2026) BMW 220 M Sport 170 HP

£34,240

Fair price

Estimated price £33,437

B78 3HG Staffordshire, Staffordshire

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

Showing 1 - 25 of 69 results

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BMW 420 (1000+)