How much does a BMW 7 Series 745e engine replacement cost in the UK?

A reconditioned 745e engine (B58B30M2 with hybrid system) typically costs £3,000‑£4,500 supply only. Fitting adds £1,200‑£1,800. As a PHEV, the hybrid system components add complexity and cost. Use our calculator for a figure specific to your vehicle.

Is the BMW 7 Series 745e engine reliable?

The B58 is a robust and refined engine – part of BMW's B‑family, known for its reliability. Common issues include coolant leaks (expansion tank, water pump) and PCV valve failure. The plug‑in hybrid system adds complexity – HV battery degradation and charging system failures are the primary PHEV‑specific concerns. With regular maintenance and proper battery care, the 745e can be a reliable and refined powertrain.

What are the common problems with the BMW 7 Series 745e?

Common issues include B58 coolant leaks (expansion tank, water pump, plastic fittings), PCV valve failure causing rough running and smoke, HV battery degradation (reduced electric range), and KLE module/charging system failure. The B58 is fundamentally robust – these are known but manageable issues.

Is it worth replacing a 745e engine, or should I scrap the car?

Given the 7 Series's retained value (typically £20,000‑£45,000+), a £3,000‑£5,500 reconditioned engine is a modest fraction of the vehicle's worth. Replacement is almost always financially viable. However, if the HV battery has also failed (costing £2,000‑£5,000+), the total repair cost may be substantial. Get a full diagnostic assessment before committing.

How do I find my 7 Series's engine code?

The 745e uses the B58B30M2 3.0‑litre turbo petrol engine combined with an 83 kW electric motor. This is stamped on the engine block and listed on your V5C. The 745e badge itself confirms the powertrain – it's the 394 PS plug‑in hybrid offered in the G11/G12 7 Series LCI from 2019‑2022.

Can I repair a 745e engine issue, or does it need replacement?

Most issues – B58 coolant leaks, PCV valve failure, charging system failures – are repairable. HV battery degradation may be covered under warranty if the vehicle is still within the warranty period (typically 8 years/100,000 miles). However, if the engine suffers major internal failure, a full engine replacement is usually more cost‑effective than a rebuild.

BMW 7 Series 745e2019–20223.0L Turbo PHEV (B58 + e‑motor)

BMW 7 Series 745e Engine Replacement — Compare Prices & Get Quotes

Name: BMW 7 Series 745e UK Engine Enquiry Data 2025
Creator: BMWEngines.uk

Get quotes today from trusted UK BMW specialists. Compare reconditioned, rebuilt and used B58 3.0‑litre turbo plug‑in hybrid powertrains for the 7 Series 745e - the refined, powerful entry to BMW's electrified flagship range. Supply & fit available nationwide.

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BMW 7 Series 745e Engines - from £2,000 to £5,500Powertrain: B58B30M2 3.0L Turbo PHEV

BMW 7 Series 745e Engines - from £2,000 to £5,500· Powertrain: B58B30M2 3.0L Turbo PHEV

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BMW 7 Series 745e - Which Powertrain Does Your Car Actually Have?

Four generations. Four eras. One guide to reliability, costs and what really matters.

Era Note

394 PS, 600 Nm - B58 is robust, PHEV system adds complexity

GenerationYearsEngine CodeReliabilityRecon CostEra Note

G11/G12 (LCI) BMW 320d G11/G12 (LCI)

2019–2022B58B30M2 (3.0L Turbo PHEV) + 83 kW e‑motor★★★★☆ [NEWLY ASSIGNED - see Data Note]£3,000–£5,000 [PLACEHOLDER - confirm vs cost sheet]394 PS, 600 Nm - B58 is robust, PHEV system adds complexity

Why use this era map?

This table is the single source every other section on this page must match. Sections 2, 4, and 6 reference it rather than restating conflicting figures.

Real UK Cost Data

Verified Reliability

Expert Insights

Updated for 2025

BMW 7 Series 745e Engine Replacement Costs

Supply Only£3,000–£4,500

Fitted (Indie)£4,200–£6,000

Warranty12–24 months

Best ForMost owners - best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£2,000–£3,500£3,000–£4,8001–6 monthsBudget priority; lower‑mileage salvage units

Reconditioned Engine£3,000–£4,500£4,200–£6,00012–24 monthsMost owners - best cost/warranty balance

Rebuilt Engine£4,000–£5,500£5,200–£7,00012–24 monthsLong‑term ownership; maximum reliability

Main Dealer New£6,500–£8,500£8,000–£10,50024–36 monthsInsurance jobs; warranty claims; full provenance

Figures above reflect the G11/G12 745e generation. The hybrid system components (electric motor, battery, inverter) add complexity and cost to any replacement. PHEV‑specific labour is typically higher than for conventional engines.

Labour estimate: Fitting a 745e engine typically takes 14‑18 hours at £75‑£110/hr (independent BMW specialist). Hybrid system integration adds to the complexity.

→ Compare 7 Series 745e engine prices from UK specialists

Common Problems With BMW 320d Engines

1. B58 Coolant Leaks - Expansion Tank & Water Pump

Symptoms: Coolant loss without visible external leaks, engine overheating, warning lights, low coolant level message.

Typical mileage: 40,000–80,000 miles.

Repair cost: £500–£1,500 [PLACEHOLDER] (expansion tank, water pump, or coolant lines replacement).

Replacement cost: N/A - repair only (if caught early; ignored coolant loss can cause overheating and engine damage).

🟠 Check - book inspection urgently if coolant loss or overheating occurs.

Our recommendation:

The B58 is a robust engine, but coolant leaks from the expansion tank, water pump, and plastic fittings are a common issue. The B58's water pump is driven by the serpentine belt and can fail. If the expansion tank or water pump develops a leak, the engine can overheat rapidly. A £500–£1,500 cooling system repair is far cheaper than the consequences of a warped head or blown head gasket. Regular inspection of coolant levels is essential.

1. B58 Coolant Leaks - Expansion Tank & Water Pump

Symptoms: Coolant loss without visible external leaks, engine overheating, warning lights, low coolant level message.

Typical mileage: 40,000–80,000 miles.

Repair cost: £500–£1,500 [PLACEHOLDER] (expansion tank, water pump, or coolant lines replacement).

Replacement cost: N/A - repair only (if caught early; ignored coolant loss can cause overheating and engine damage).

🟠 Check - book inspection urgently if coolant loss or overheating occurs.

Our recommendation:

2. B58 PCV Valve Failure

Symptoms: Rough idle, engine misfire, blue/white smoke from exhaust, engine warning light, whistling noise from the engine.

Typical mileage: 50,000–80,000 miles.

Repair cost: £400–£800 [PLACEHOLDER] (PCV valve replacement).

Replacement cost: N/A - repair only (if caught early; ignored PCV failure can lead to oil consumption and catalytic converter damage).

🟠 Check - book inspection urgently if symptoms develop.

Our recommendation:

The B58's PCV valve is a known weak point. A failing PCV valve can cause rough running, engine misfires, and blue/white smoke from the exhaust due to oil being drawn into the intake. If the PCV valve fails, the engine may run rough and consume oil. Early diagnosis and replacement are essential - ignoring it can lead to more expensive repairs.

3. HV (High‑Voltage) Battery Degradation (PHEV)

Symptoms: Reduced electric‑only range (noted drop from 35 miles to 20‑25 miles over time), longer charging times, hybrid system warnings on the dashboard, the car running only on petrol.

Typical mileage: 30,000‑60,000 miles (age‑related as much as mileage - the 12 kWh battery is subject to degradation over time).

Repair cost: £2,000‑£5,000+ [PLACEHOLDER] (HV battery replacement - if available).

Replacement cost: N/A - battery replacement only (if ignored, the vehicle runs on petrol only, reducing fuel economy).

🟠 Check - book inspection urgently if HV battery warnings appear or if electric range drops significantly.

Our recommendation:

The 745e's 12 kWh lithium‑ion battery is a significant component. Over time, battery degradation is inevitable - the range will drop, and charging may take longer. BMW batteries are generally well‑engineered, but if the battery fails outside of the warranty period (typically 6‑8 years), replacement is expensive. If you notice a significant drop in electric range or warning lights, have the battery health checked by a specialist.

4. Charging System / KLE Module Failure

Symptoms: The car fails to charge or charges very slowly, charging port faults, dashboard warnings, the car running only on petrol.

Typical mileage: Any mileage - can occur at any time.

Repair cost: £800‑£2,000 [PLACEHOLDER] (KLE module or charging port repair/replacement).

Replacement cost: N/A - repair only.

🟠 Check - book inspection urgently if the car fails to charge.

Our recommendation:

The KLE (Comfort Charging Electronics Controller) module is a common failure point on BMW PHEVs. If the car fails to charge or charges slowly, the KLE module may be faulty. Charging port/socket faults are also reported. This is a specialist repair - a diagnostic check will confirm the issue. If your 745e won't charge, don't ignore it - the car will run on petrol only, negating the benefits of the hybrid system.

Weighing Your Options?

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BMW 7 Series 745e - Repair, Buy, or Replace?

Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

BMW 7 Series 745e - Repair, Buy, or Replace?

Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

Can It Be Repaired?

ProblemRepairable?Typical CostWhen It Makes SenseB58 coolant leaks✅ Yes£500–£1,500 [PLACEHOLDER]Essential maintenance - always worth doingB58 PCV valve failure✅ Yes£400–£800 [PLACEHOLDER]Worth fixing - common and well‑understood repairHV battery degradation⚠️ Sometimes£2,000‑£5,000+ [PLACEHOLDER]May be covered under warranty; if not, assess cost vs. vehicle valueKLE module / charging system✅ Yes£800‑£2,000 [PLACEHOLDER]Worth fixing - the car needs to charge to be a PHEVMajor internal engine failure❌ Usually No£3,000‑£5,500+Full engine replacement often more cost‑effective

Buying This BMW 7 Series 745e? Check These First

Buy If

Full BMW service history with correct hybrid system maintenance
HV battery health check completed and documented
Evidence of regular charging and battery care
Warranty remaining - the 745e is a complex, expensive vehicle to repair out of warranty

Avoid If

Any sign of HV battery warnings or reduced electric range
No evidence of regular charging - the hybrid battery may have been neglected
Any sign of coolant loss - B58 cooling system issues are common
Poor service history - these vehicles demand strict maintenance

Closing Verdict

The BMW 745e represents the refined entry point to BMW's electrified flagship range - combining the robust B58 3.0‑litre turbo petrol engine with an 83 kW electric motor for 394 PS and 600 Nm. It offers genuine electric‑only capability for short commutes (up to 35 miles) and effortless performance when the petrol engine is engaged. However, PHEV complexity brings potential issues - battery degradation, charging system failures, and the usual B58 cooling system concerns. Buy on service history above all else - a vehicle with documented battery health checks and regular maintenance is a safe bet; a neglected example can be expensive to repair.

Don't guess.Get the right engine at the right price.

→ Compare 7 Series 745e engine prices before you buy

Don't Guess. Compare.

Get real quotes from vetted UK specialists and make the right call for your 320d.

→ Compare 7 Series 745e engine prices before you buy

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Thousands of 320d Owners Helped

Buying Checklist

Before you buy a used BMW 7 Series 745e (or before you commit to an engine replacement), check these:

1. Electric Range

Does the displayed range match expectations? (35 miles claimed, real‑world ~20‑30 miles)

2. Service History

Full BMW history with hybrid system maintenance records

3. HV Battery Health

Has the battery been tested? What's its state of health?

4. Charging

Does the car charge correctly? (KLE module and charging port check)

5. Coolant Level

Any sign of coolant loss? (B58 cooling system common issue)

6. PCV System

Any rough idle, misfire, or smoke? (PCV valve common issue)

7. Engine Warning Light

Have codes been read? Any hybrid system or engine codes?

8. MOT History

Check for emissions‑related failures or any advisory notes

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 320d pitfalls.

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 320d pitfalls.

BMW 320d Engine Codes

This table's rows match Section 1B's Era Map exactly.

B58B30M2 + 83 kW e‑motor

Years2019–2022

Power394 PS (290 kW) / 600 Nm

2025 Enquiries- (pattern data)

Avg. Recon Cost£3,000–£4,500 [PLACEHOLDER]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

B58B30M2 + 83 kW e‑motor2019–2022394 PS (290 kW) / 600 Nm- (pattern data)£3,000–£4,500 [PLACEHOLDER]

Technical Specs

B58B30M2 PHEV Powertrain

Displacement2,998 cc

Cylinders6‑cylinder inline

Compression Ratio11.0:1

Fuel SystemDirect injection

AspirationTwin‑scroll turbocharger

ValvetrainDOHC, 4 valves per cylinder, Valvetronic

Electric Motor83 kW (113 PS) / 265 Nm

Battery12 kWh lithium‑ion

TransmissionZF 8‑speed Steptronic automatic

→ Compare 7 Series 745e engine prices for your BMW

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Market Intelligence

Most Common Failure

HV battery degradation / B58 coolant leaks

PHEV‑specific and B58‑specific issues

Average Enquiry Mileage

30,000

‑50,000 miles

[PATTERN DATA]

Average Replacement Cost

£3,500

reconditioned, supply only

[PLACEHOLDER]

Most Requested Engine Code

B58B30M2

sole 745e PHEV powertrain

[PATTERN DATA]

Peak Enquiry Season

Spring/Summer

new model year interest

[PATTERN DATA]

Regional Demand

South East22%

London18%

South West (12%) - premium hybrid strongholds

PATTERN DATA

Regional Demand Breakdown

22%South East

18%London

BMW 320d - Frequently Asked Questions

All prices are indicative UK market ranges based on historical quote data from our network of engine specialists. Actual costs vary by variant, engine code, damage severity and workshop location. Use our free comparison tool to get tailored quotes. Every engine supplied through EnginesMarket carries a minimum 12‑month unlimited‑mileage warranty - always confirm terms with your chosen supplier.

Why UK BMW 7 Series 745e Owners Trust BMWEngines.uk

Trusted 745e Powertrain Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real 7 Series owners, as part of the Engine Finders network, covering the B58 plug‑in hybrid powertrain with specialist knowledge of PHEV systems, battery health, and B58 engine maintenance.
Compare 745e Replacement Companies
see prices, warranty terms and supply & fit options side‑by‑side before you commit, with specialists who understand the B58's cooling system requirements, the hybrid system's complexities, and the importance of HV battery health checks.
UK Engine Replacement Services for the 7 Series Hybrid
supply‑only or full supply & fit available nationwide, covering the G11/G12 745e from 2019 to 2022, with specialist knowledge of BMW's flagship PHEV technology and the B58 engine family.

Find the best BMW 7 Series 745e engine replacement UK drivers rely on. Compare prices from trusted specialists on EnginesMarket today and get back on the road with confidence.

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