How much does a BMW X4 G02 engine replacement cost in the UK?

A reconditioned G02 engine typically costs £2,500–£11,000 supply only [BMW-QUOTE], depending on the engine -the B48 and B47 four-cylinders sit at £2,500–£5,000, the B58 and B57 six-cylinders at £4,500–£7,500, and the S58 X4 M at £6,000–£11,000. Fitting adds £520–£1,170. Use our calculator for a personalised figure.

Which G02 engine is the most reliable?

The B58B30 (M40i) is the G02's most reliable engine -BMW's modern turbocharged straight-six is smooth, responsive, and widely considered one of BMW's most durable modern engines. The B48 four-cylinder is also very reliable, and the B47 diesel is improved over the N47.

What are the common problems with the BMW X4 G02?

The B58 six-cylinder (M40i) suffers from oil filter housing gasket leaks. The S58 (X4 M/X4 M Competition) has a known crank hub spin risk -more common on tuned cars. The B47 and B57 diesel engines can have EGR cooler leaks and DPF clogging with urban use. The B48 four-cylinders are generally robust with minor cooling system and PCV issues.

Is the BMW X4 G02 reliable?

Yes -the G02 uses BMW's most modern and reliable engine family. The B48, B58, B47, and B57 are all well-established with strong reliability records. The S58 is more demanding but fundamentally strong. Regular maintenance is the key -these are complex, high-performance cars.

Which G02 engine should I avoid?

No engine outright -but if you're buying an X4 M, be prepared for the running costs and budget for a crank hub fix if the car is modified or you plan to modify it. For diesel buyers, ensure the car has been used for regular motorway journeys to keep the DPF clear. Any engine without full service history is a risk.

How do I know if my G02 engine needs replacing?

Oil leaks or burning smell (B58 oil filter housing), crank hub symptoms like misfire or timing codes (S58), coolant loss or reduced power (diesel EGR/DPF), persistent warning lights, or coolant loss are the key warning signs. Use our diagnostic calculator for a personalised assessment.

Is it worth replacing a G02 engine, or should I scrap the car?

Depends on the car's value. Against a £25,000 M40i, a £4,500–£7,000 B58 recon is 18–28% -well within our 70% BMW threshold. Against a £20,000 xDrive30i, a £2,500–£4,500 B48 recon is 13–23% -a straightforward repair decision. For an X4 M at £25,000+, a £6,000–£11,000 S58 recon is 24–44% -a serious decision but viable for a well-kept example. Value the car first; budget for preventative work if buying used.

How long do G02 engines last?

The B58 and B48 can comfortably exceed 150,000 miles with proper servicing. The B47 and B57 diesels are similarly durable but require regular motorway driving to keep the DPF clear -100,000+ miles is achievable. The S58 is capable of high mileage but crank hub and cooling system work should be budgeted for at 50k–60k mile intervals.

What is the difference between the G02, F26, and G01?

The G02 (2018–2025) is the second-generation X4, succeeding the F26 (2014–2018). It's built on the CLAR platform shared with the G01 X3 (2017–2024). The G02 is the coupé-SUV variant; the G01 is the conventional SUV. The G02 has a sportier roofline and styling but shares its mechanicals with the G01. The F26 was based on the older F25 X3 platform. The G02 was discontinued in 2025 with no direct successor.

How do I find my G02 engine code?

Listed on the VIN plate and vehicle documentation; the engine code is also stamped on the cylinder block. For petrol: B48B20A/B (xDrive20i), B48B20O1/B (xDrive30i), B58B30A/B (M40i), S58B30A (X4 M/Competition). For diesel: B47D20B (xDrive20d/25d), B57D30O1 (xDrive30d). Tell us your variant and registration year and we'll identify it -20+ vetted BMW specialists will confirm it for free.

G02 Engine Replacement Cost UK -Compare Quotes

Name: BMW X4 G02 UK Engine Enquiry Data 2025
Creator: BMWEngines.uk

BMW X4 G02 Engine Codes -The Complete Database

Every engine fitted to the X4 G02 specifically -including the full range of four-cylinder B48 petrol and B47 diesel engines, the B58 six-cylinder petrol, the S58-powered X4 M, and European-market diesel six-cylinders.

Engine CodeFamilyFuelDisplacementPowerYears (G02)Variants (badges)Reliability2025 EnquiriesAvg. Recon Cost

B48B20ABMW B48Petrol2.0L (1998cc)181–184 bhp (135 kW)2018–2021xDrive20i★★★★☆ [PROVISIONAL -pending dedicated Engine Page]-(pattern data)£2,500–£4,500 [BMW-QUOTE]

B48B20O1BMW B48Petrol2.0L (1998cc)241–245 bhp (180 kW)2018–2021xDrive30i★★★★☆ [PROVISIONAL -pending dedicated Engine Page]-(pattern data)£2,500–£4,500 [BMW-QUOTE]

B48B20B (MHEV)BMW B48Petrol MHEV2.0L (1998cc)181–184 bhp (135 kW)2021–2025xDrive20i (LCI)★★★★☆ [PROVISIONAL -pending dedicated Engine Page]-(pattern data)£2,500–£4,500 [BMW-QUOTE]

B48B20B (MHEV)BMW B48Petrol MHEV2.0L (1998cc)249 bhp (183 kW)2021–2025xDrive30i (LCI)★★★★☆ [PROVISIONAL -pending dedicated Engine Page]-(pattern data)£2,500–£4,500 [BMW-QUOTE]

B58B30ABMW B58Petrol3.0L (2998cc)354–360 bhp (260–265 kW)2018–2021M40i★★★★☆ [PROVISIONAL -pending dedicated Engine Page]-(pattern data)£4,500–£7,000 [BMW-QUOTE]

B58B30B (MHEV)BMW B58Petrol MHEV3.0L (2998cc)382–387 bhp (285 kW)2021–2025M40i (LCI)★★★★☆ [PROVISIONAL -pending dedicated Engine Page]-(pattern data)£4,500–£7,000 [BMW-QUOTE]

B47D20BBMW B47Diesel2.0L (1995cc)190–231 bhp (140–170 kW)2018–2025xDrive20d, xDrive25d★★★★☆ [PROVISIONAL -pending dedicated Engine Page]-(pattern data)£3,000–£5,000 [BMW-QUOTE]

B57D30O1BMW B57Diesel3.0L (2993cc)265 bhp2018–2025xDrive30d★★★★☆ [PROVISIONAL -pending dedicated Engine Page]-(pattern data)£4,500–£7,000 [BMW-QUOTE]

S58B30ABMW S58Petrol3.0L (2993cc)473–480 bhp (353 kW)2019–2025X4 M★★★☆☆ [PROVISIONAL -pending dedicated Engine Page]-(pattern data)£6,000–£10,000 [BMW-QUOTE]

S58B30ABMW S58Petrol3.0L (2993cc)503–510 bhp (375 kW)2019–2025X4 M Competition★★★☆☆ [PROVISIONAL -pending dedicated Engine Page]-(pattern data)£6,500–£11,000 [BMW-QUOTE]

Engine CodeFuelPowerYearsReliabilityEnquiriesAvg. Recon Cost

B48B20ABMW B48Petrol181–184 bhp (135 kW)2018–2021★★★★☆ [PROVISIONAL -pending dedicated Engine Page]-(pattern data)£2,500–£4,500 [BMW-QUOTE]

B48B20O1BMW B48Petrol241–245 bhp (180 kW)2018–2021★★★★☆ [PROVISIONAL -pending dedicated Engine Page]-(pattern data)£2,500–£4,500 [BMW-QUOTE]

B48B20B (MHEV)BMW B48Petrol MHEV181–184 bhp (135 kW)2021–2025★★★★☆ [PROVISIONAL -pending dedicated Engine Page]-(pattern data)£2,500–£4,500 [BMW-QUOTE]

B48B20B (MHEV)BMW B48Petrol MHEV249 bhp (183 kW)2021–2025★★★★☆ [PROVISIONAL -pending dedicated Engine Page]-(pattern data)£2,500–£4,500 [BMW-QUOTE]

B58B30ABMW B58Petrol354–360 bhp (260–265 kW)2018–2021★★★★☆ [PROVISIONAL -pending dedicated Engine Page]-(pattern data)£4,500–£7,000 [BMW-QUOTE]

B58B30B (MHEV)BMW B58Petrol MHEV382–387 bhp (285 kW)2021–2025★★★★☆ [PROVISIONAL -pending dedicated Engine Page]-(pattern data)£4,500–£7,000 [BMW-QUOTE]

B47D20BBMW B47Diesel190–231 bhp (140–170 kW)2018–2025★★★★☆ [PROVISIONAL -pending dedicated Engine Page]-(pattern data)£3,000–£5,000 [BMW-QUOTE]

B57D30O1BMW B57Diesel265 bhp2018–2025★★★★☆ [PROVISIONAL -pending dedicated Engine Page]-(pattern data)£4,500–£7,000 [BMW-QUOTE]

S58B30ABMW S58Petrol473–480 bhp (353 kW)2019–2025★★★☆☆ [PROVISIONAL -pending dedicated Engine Page]-(pattern data)£6,000–£10,000 [BMW-QUOTE]

S58B30ABMW S58Petrol503–510 bhp (375 kW)2019–2025★★★☆☆ [PROVISIONAL -pending dedicated Engine Page]-(pattern data)£6,500–£11,000 [BMW-QUOTE]

Overview

BMW X4 G02 -Overview

The G02 is the second generation of the BMW X4, a compact luxury crossover SUV produced from February 2018 to November 2025.

Built on the CLAR platform shared with the X3 G01, it succeeded the F26 and introduced a stiffer body structure, improved dynamics, and a broader engine lineup. The engine range includes B48 four-cylinder petrols and B47 diesels, B58 six-cylinder petrols, B57 six-cylinder diesels (Europe), and the S58-powered X4 M. A 2021 Life Cycle Impulse brought mild-hybrid technology and revised styling. The X4 G02 was discontinued in November 2025 with no direct successor planned.

Key Facts

Platform

BMW CLAR (front-engine, rear-wheel drive / xDrive)

Predecessor

BMW X4 (F26)

Successor

None (X4 discontinued after G02)

Sibling body styles in this generation

G01 X3, G08 iX3

Market Intelligence

The X4 nameplate generated significant UK engine enquiries in 2025 [BMW-VERIFIED], with demand concentrated on the B48-powered xDrive20i and B58-powered M40i models based on market patterns.

BMW X4 G02 -Overview

The G02 is the second generation of the BMW X4, a compact luxury crossover SUV produced from February 2018 to November 2025.

Built on the CLAR platform shared with the X3 G01, it succeeded the F26 and introduced a stiffer body structure, improved dynamics, and a broader engine lineup. The engine range includes B48 four-cylinder petrols and B47 diesels, B58 six-cylinder petrols, B57 six-cylinder diesels (Europe), and the S58-powered X4 M. A 2021 Life Cycle Impulse brought mild-hybrid technology and revised styling. The X4 G02 was discontinued in November 2025 with no direct successor planned.

Key Facts

Platform

BMW CLAR (front-engine, rear-wheel drive / xDrive)

Predecessor

BMW X4 (F26)

Successor

None (X4 discontinued after G02)

Sibling body styles in this generation

G01 X3, G08 iX3

Market Intelligence

The X4 nameplate generated significant UK engine enquiries in 2025 [BMW-VERIFIED], with demand concentrated on the B48-powered xDrive20i and B58-powered M40i models based on market patterns.

Best & Worst Engines

Best Value

B48B20O1 (xDrive30i)

“The 2.0-litre B48 delivers 245–249 bhp -more than enough for everyday driving -with excellent fuel economy and lower running costs than the six-cylinder. It's the sensible choice that doesn't feel sensible.”

Who it's for: buyers who want modern turbo performance with sensible running costs.

Highest Risk

S58B30A (X4 M / X4 M Competition)

“The S58 is an engineering masterpiece -a twin-turbo straight-six based on the B58 with a closed-deck crankcase and 350-bar fuel injection. But it's complex, high-strung, and expensive to maintain. Crank hub issues, cooling system failures, and high running costs are well-documented concerns.”

Who it's for: buyers with deep pockets who want the ultimate X4 -and are prepared for the running costs.

Most Expensive Failure

S58B30A (X4 M Competition)

“A full S58 engine replacement can exceed £11,000. Crank hub failure is catastrophic and requires an engine-out rebuild. Cooling system leaks and high-pressure fuel system issues are also costly. The X4 M is a performance bargain used -but the maintenance bills are M-car levels.”

Who it's for: buyers who understand that M-car ownership comes with M-car costs.

Most Overlooked

B57D30O1 (xDrive30d)

“The six-cylinder diesel is often overlooked in favour of the M40i, but it delivers 265 bhp of effortless torque with genuine 40+ mpg economy. It's the thinking buyer's choice -refined, powerful, and efficient. Not available in all markets, but a gem where it is.”

Who it's for: buyers who want six-cylinder refinement with diesel economy.

Best Value

B48B20O1 (xDrive30i)

“The 2.0-litre B48 delivers 245–249 bhp -more than enough for everyday driving -with excellent fuel economy and lower running costs than the six-cylinder. It's the sensible choice that doesn't feel sensible.”

Who it's for: buyers who want modern turbo performance with sensible running costs.

Highest Risk

S58B30A (X4 M / X4 M Competition)

“The S58 is an engineering masterpiece -a twin-turbo straight-six based on the B58 with a closed-deck crankcase and 350-bar fuel injection. But it's complex, high-strung, and expensive to maintain. Crank hub issues, cooling system failures, and high running costs are well-documented concerns.”

Who it's for: buyers with deep pockets who want the ultimate X4 -and are prepared for the running costs.

Most Expensive Failure

S58B30A (X4 M Competition)

“A full S58 engine replacement can exceed £11,000. Crank hub failure is catastrophic and requires an engine-out rebuild. Cooling system leaks and high-pressure fuel system issues are also costly. The X4 M is a performance bargain used -but the maintenance bills are M-car levels.”

Who it's for: buyers who understand that M-car ownership comes with M-car costs.

Most Overlooked

B57D30O1 (xDrive30d)

“The six-cylinder diesel is often overlooked in favour of the M40i, but it delivers 265 bhp of effortless torque with genuine 40+ mpg economy. It's the thinking buyer's choice -refined, powerful, and efficient. Not available in all markets, but a gem where it is.”

Who it's for: buyers who want six-cylinder refinement with diesel economy.

BMW X4 G02 -Ownership Economics

EngineTypical MileageCommon Major FailureRepair Cost (Specialist)Replacement Cost (Recon)Ownership Verdict

B48B20A/B (xDrive20i)40k–80kCoolant system, PCV£300–£800£2,500–£4,500

Solid Four -modern and reliable

B48B20O1/B (xDrive30i)40k–80kCoolant system, PCV£300–£800£2,500–£4,500

Best 4-Cyl -245 bhp, efficient

B58B30A/B (M40i)40k–80kOil filter housing gasket leak, PCV£400–£1,200£4,500–£7,000

Definitive G02 -the one to buy

B47D20B (xDrive20d/25d)60k–120kEGR cooler, DPF£400–£1,200£3,000–£5,000

Best Diesel -improved over N47

B57D30O1 (xDrive30d)60k–120kEGR cooler, DPF, AdBlue£500–£1,500£4,500–£7,000

Torquey Six -refined and efficient

S58B30A (X4 M)30k–60kCrank hub, cooling system£1,500–£4,000£6,000–£10,000

High Power, High Cost -budget for maintenance

S58B30A (X4 M Competition)30k–60kCrank hub, cooling system£2,000–£5,000£6,500–£11,000

Ultimate X4 -expensive to maintain

EngineTypical MileageCommon Major FailureRepair Cost (Specialist)Replacement Cost (Recon)Ownership Verdict

B48B20A/B (xDrive20i)40k–80kCoolant system, PCV£300–£800£2,500–£4,500

Solid Four -modern and reliable

B48B20O1/B (xDrive30i)40k–80kCoolant system, PCV£300–£800£2,500–£4,500

Best 4-Cyl -245 bhp, efficient

B58B30A/B (M40i)40k–80kOil filter housing gasket leak, PCV£400–£1,200£4,500–£7,000

Definitive G02 -the one to buy

B47D20B (xDrive20d/25d)60k–120kEGR cooler, DPF£400–£1,200£3,000–£5,000

Best Diesel -improved over N47

B57D30O1 (xDrive30d)60k–120kEGR cooler, DPF, AdBlue£500–£1,500£4,500–£7,000

Torquey Six -refined and efficient

S58B30A (X4 M)30k–60kCrank hub, cooling system£1,500–£4,000£6,000–£10,000

High Power, High Cost -budget for maintenance

S58B30A (X4 M Competition)30k–60kCrank hub, cooling system£2,000–£5,000£6,500–£11,000

Ultimate X4 -expensive to maintain

The G02 rule

A £4,500–£7,000 B58 recon against a £20,000–£35,000 M40i sits at 13–35% of the car's value -well within our 70% BMW scrap threshold. For an X4 M at £25,000+, a £6,000–£11,000 S58 recon is 24–44% -a repair decision, not a scrap question. These are high-value cars; the replacement cost is a manageable proportion of the vehicle's worth. But beware of S58 crank hub issues -budget for preventative work if buying used.

Key Takeaways

Which G02 Costs Least To Own?
B47D20B (xDrive20d) -proven diesel efficiency, low CO2, strong economy.
Which G02 Costs Most To Own?
S58B30A (X4 M Competition) -crank hub risk, expensive parts, high running costs.
Which G02 Is Best Value?
B58B30 (M40i) -the definitive G02 engine, modern reliability, strong performance, and often the sweet spot in the range.

Common Problems

01

B58

Oil Filter Housing Gasket Leak (M40i)

Affected models:

Typical failure mileage:

Root cause:

Tiered Cost Table

Our Recommendation

Have the oil filter housing inspected at every service -a £400–£1,000 gasket replacement is cheaper than the £4,500+ replacement that follows a catastrophic oil loss. On a £25,000+ car, this is a manageable cost of ownership.

02

S58

Crank Hub Failure (X4 M / X4 M Competition)

Affected models:

Typical failure mileage:

Root cause:

Tiered Cost Table

Our Recommendation

If you're buying an X4 M, budget for a crank hub fix if the car is modified or you plan to modify it -£1,800–£3,000 is cheaper than the £6,000+ replacement that follows a failure. On a stock car, it's a risk you can manage, but the peace of mind is worth the cost.

03

B47/B57

Diesel EGR Cooler & DPF (xDrive20d, xDrive25d, xDrive30d)

Affected models:

Typical failure mileage:

Root cause:

Tiered Cost Table

Our Recommendation

If you're buying a diesel G02 for urban use, budget for DPF maintenance -£400–£1,200 for a clean or EGR cooler replacement is cheaper than the £3,000+ replacement that follows a catastrophic failure.

04

B48

Cooling System & PCV (xDrive20i, xDrive30i)

Affected models:

Typical failure mileage:

Root cause:

Tiered Cost Table

Our Recommendation

Have the cooling system and PCV valve inspected at every major service -a £300–£800 preventative repair is cheaper than the £2,500+ replacement that follows a failure.

X4 G02 Engine Replacement Costs -By Engine and Condition

VariantEngine CodeUsed (Supply)Reconditioned (Supply)Rebuilt (Supply)Labour Hours

xDrive20i (2018–2021)B48B20A£1,500–£2,800£2,500–£4,500£3,500–£5,5008–12 hrs

xDrive30i (2018–2021)B48B20O1£1,500–£2,800£2,500–£4,500£3,500–£5,5008–12 hrs

xDrive20i (2021–2025)B48B20B£1,500–£2,800£2,500–£4,500£3,500–£5,5008–12 hrs

xDrive30i (2021–2025)B48B20B£1,800–£3,200£2,800–£5,000£4,000–£6,5008–12 hrs

M40i (2018–2021)B58B30A£2,800–£4,500£4,500–£7,000£6,000–£9,00010–14 hrs

M40i (2021–2025)B58B30B£3,000–£5,000£4,800–£7,500£6,500–£9,50010–14 hrs

xDrive20d / xDrive25dB47D20B£1,800–£3,000£3,000–£5,000£4,000–£6,50010–14 hrs

xDrive30dB57D30O1£2,800–£4,500£4,500–£7,000£6,000–£9,00012–16 hrs

X4 MS58B30A (473 bhp)£3,500–£6,000£6,000–£10,000£8,000–£13,00014–18 hrs

X4 M CompetitionS58B30A (503 bhp)£4,000–£6,500£6,500–£11,000£9,000–£14,00014–18 hrs

Core Variants

Diesel & Petrol Lineup

Diesel Variants

xDrive20dxDrive25dxDrive30d

Petrol Variants

xDrive20ixDrive30iM40iX4 MX4 M Competition

Scope note: All variants listed are G02 only. The X4 M (F98) is technically a separate model designation but shares the G02 platform. The xDrive30d (B57 six-cylinder diesel) was available in European markets but not in North America.

Diesel & Petrol Lineup

Diesel Variants

xDrive20dxDrive25dxDrive30d

Petrol Variants

xDrive20ixDrive30iM40iX4 MX4 M Competition

Scope note: All variants listed are G02 only. The X4 M (F98) is technically a separate model designation but shares the G02 platform. The xDrive30d (B57 six-cylinder diesel) was available in European markets but not in North America.

Market Intelligence

Most Requested E90 Engines (2025)

1.1. B58B30 (M40i) -pattern data
2.2. B48B20O1 (xDrive30i) -pattern data
3.3. B47D20B (xDrive20d) -pattern data

Most Requested E90 Variants

1.1. M40i
2.2. xDrive30i
3.3. xDrive20d

Average E90 Replacement Cost

£4,000–£7,000 (reconditioned, supply only) [BMW-QUOTE]

Most Common E90 Failures

1.1. B58 oil filter housing gasket leak
2.2. S58 crank hub failure (X4 M)
3.3. B47/B57 EGR cooler & DPF (diesel)

Live Feed

VehicleLocationIssueEnquiries

BMW X4 M40i

G02 (B58)

Manchester

Oil leak from filter housing, burning smell

3

enquiries

BMW X4 M Competition

G02 (S58)

Birmingham

Crank hub investigation, tuned car

2

enquiries

BMW X4 xDrive20d

G02 (B47)

London

EGR cooler leak, coolant loss

2

enquiries

Updated Monthly

FAQ

BMW 3 Series E90 rear three-quarter view

Why UK BMW X4 G02 Owners Trust BMWEngines.uk

Trusted G02 Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real G02 owners, as part of the Engine Finders network.
Compare G02 Engine Replacement Companies
see prices, warranty terms and supply & fit options side‑by‑side before you commit.
UK Engine Replacement Services for G02
covering every variant from xDrive20d to X4 M Competition, with supply‑only or full supply & fit available nationwide.

Find the best BMW X4 G02 engine replacement UK drivers rely on. Compare real prices from trusted specialists on EnginesMarket today and get back on the road with confidence.

Compare BMW X4 G02 Engine Prices on EnginesMarket

Why UK BMW X4 G02 Owners Trust BMWEngines.uk

Trusted G02 Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real G02 owners, as part of the Engine Finders network.
Compare G02 Engine Replacement Companies
see prices, warranty terms and supply & fit options side‑by‑side before you commit.
UK Engine Replacement Services for G02
covering every variant from xDrive20d to X4 M Competition, with supply‑only or full supply & fit available nationwide.

Find the best BMW X4 G02 engine replacement UK drivers rely on. Compare real prices from trusted specialists on EnginesMarket today and get back on the road with confidence.

Compare BMW X4 G02 Engine Prices on EnginesMarket

BMW X4 G02 Engines -The Complete UK Guide

BMW X4 G02 Engine Codes -The Complete Database

BMW X4 G02 -Overview

BMW X4 G02 -Overview

Best &amp; Worst Engines

BMW X4 G02 -Ownership Economics

Common Problems

X4 G02 Engine Replacement Costs -By Engine and Condition

Diesel &amp; Petrol Lineup

Diesel &amp; Petrol Lineup

Market Intelligence

FAQ

Why UK BMW X4 G02 Owners Trust BMWEngines.uk

Why UK BMW X4 G02 Owners Trust BMWEngines.uk

Best & Worst Engines

Diesel & Petrol Lineup

Diesel & Petrol Lineup