BMW 7 Series 750e2023–presentB58 + e-Motor
BMW 7 Series 750e Engine Replacement —Compare Prices &
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Get quotes today from trusted UK BMW 750e specialists. Compare reconditioned, rebuilt and used B58 engines and hybrid drive units for the flagship plug-in hybrid — supply & fit available nationwide.
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BMW 750e Engines — from £5,000 to £12,000Code: B58B30 + e-Motor
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- Instant Quotes
- No Obligation
- 100% Free
- Reconditioned
- Rebuilt
- Used
- Supply & Fit Available
- UK-Wide Network
The 750e Through Time — Era Map
One generation. One era. One guide to reliability, costs and what really matters.
Era Note
BMW's flagship plug-in hybrid — proven B58 petrol combined with electric motor; battery degradation and cooling system are the main watchpoints.
Why use this era map?
Every cost guide, reliability rating and engine code on this page is aligned to the data above. This keeps everything consistent and trustworthy.
- Real UKCost Data
- VerifiedReliability
- ExpertInsights
- Updated for2025
BMW 7 Series 750e Engine Replacement Costs
- Supply Only£5,000 – £7,500
- Fitted (Indie)£6,100 – £8,800
- Warranty3–6 months
- Best ForBudget priority; vehicle under £25,000
- Supply Only£6,000 – £9,000
- Fitted (Indie)£7,200 – £10,500
- Warranty12–24 months
- Best ForMost owners — best cost/warranty balance
- Supply Only£8,000 – £12,000
- Fitted (Indie)£9,200 – £13,500
- Warranty12–24 months
- Best ForLong-term ownership; 3+ year horizon
- Supply Only£15,000 – £22,000
- Fitted (Indie)£17,000 – £25,000
- Warranty24–36 months
- Best ForInsurance jobs, warranty claims; high-voltage system requires specialist equipment
Labour estimate: Fitting a 750e engine and hybrid system typically takes 14–18 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer). Hybrid system work requires specialist high-voltage training.
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20+ vetted BMW specialists, every 750e variant covered, with a 12-month warranty as standard.
750e — Repair, Buy, or Replace?
Not every issue means a new engine.Here’s what can be repaired, when it makes sense, and what to check before you buy.
Can It Be Repaired?
| Problem | Repairable? | Typical Cost | When It Makes Sense |
|---|---|---|---|
| Battery degradation (750e) | Depends | £3,000 – £6,000 | Cell replacement is viable if caught early; full pack replacement is expensive |
| Electric motor cooling pump failure (750e) | Yes | £1,000 – £2,000 | Straightforward replacement; don't ignore cooling warnings |
| Charging system failure (750e) | Yes | £1,500 – £3,000 | Control unit or charging port replacement; specialist required |
| Water pump failure (B58) | Yes | £500 – £1,200 | Preventative — replace at 60,000 miles |
| Timing chain wear (B58) | Yes | £1,500 – £2,500 | If caught early; very rare on B58 |
| Hybrid transmission failure | Sometimes | £5,000 – £9,000 | Assess against vehicle value; often cheaper to replace the whole unit |
Battery degradation (750e)
Cell replacement is viable if caught early; full pack replacement is expensive
Electric motor cooling pump failure (750e)
Straightforward replacement; don't ignore cooling warnings
Charging system failure (750e)
Control unit or charging port replacement; specialist required
Water pump failure (B58)
Preventative — replace at 60,000 miles
Timing chain wear (B58)
If caught early; very rare on B58
Hybrid transmission failure
Assess against vehicle value; often cheaper to replace the whole unit
Buying This 750e? Check These First
Buy if:
- Full BMW service history with documented oil-change intervals
- Battery health report available — check capacity against new (aim for >85% of original)
- Evidence of regular charging and use — hybrid systems prefer regular operation
- Low-mileage example with full running-in service completed
Avoid if:
- Drivetrain warning lights with no diagnosis
- Significantly reduced electric range compared to new (below 70% of original)
- No service history — the B58 is reliable but the hybrid system demands maintenance
- Charging issues — the car won't charge or takes significantly longer than expected
Closing verdict
The 750e is BMW's flagship plug-in hybrid, combining the proven B58 inline-six with an efficient electric motor. The B58 itself is one of BMW's most reliable engines, but the hybrid system adds complexity. Buy on battery health and service history — this is a premium vehicle that demands premium care.
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Buying Checklist
Before you buy a used BMW 750e (or before you commit to an engine replacement), check these:
1. Battery Health
What is the current electric range compared to new? Check the battery health report
2. Cold Start
Listen for any rattle on startup (timing chain wear — very rare on B58)
3. Service History
Including B58 engine maintenance and hybrid system checks
4. Charging System
Does the car charge correctly? Any error messages?
5. Drivetrain Warning
Any warning lights on the dash? Have codes been read?
6. Electric Range
Test the electric range in real conditions; significant loss indicates battery degradation
7. Regenerative Braking
Does it function correctly? Any unusual noises from the transmission?
8. MOT History
Check for emissions-related failures; the B58 should pass easily if well-maintained
Buying Checklist
Before you buy a used BMW 750e (or before you commit to an engine replacement), check these:
- 1
Battery Health
What is the current electric range compared to new? Check the battery health report
- 2
Cold Start
Listen for any rattle on startup (timing chain wear — very rare on B58)
- 3
Service History
Including B58 engine maintenance and hybrid system checks
- 4
Charging System
Does the car charge correctly? Any error messages?
- 5
Drivetrain Warning
Any warning lights on the dash? Have codes been read?
- 6
Electric Range
Test the electric range in real conditions; significant loss indicates battery degradation
- 7
Regenerative Braking
Does it function correctly? Any unusual noises from the transmission?
- 8
MOT History
Check for emissions-related failures; the B58 should pass easily if well-maintained
Buy smart. Drive with confidence.
A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 7 Series 750e pitfalls.
Engine Codes
B58B30 + e-Motor
- Years
- 2023–present
- Power
- 489 bhp (total) / 18.7 kWh battery
- 2025 Enquiries
- —(pattern data)
- Avg. Recon Cost
- £6,000–£10,000[PLACEHOLDER]
Technical SpecsB58 + e-Motor
- Displacement (B58)
- 2,998cc
- Cylinders
- 6-cylinder inline
- Compression Ratio
- 11.0:1
- Fuel System
- Direct injection
- Turbocharger
- Single twin-scroll turbo
- Electric Motor
- Integrated into 8-speed automatic transmission
- Battery
- 18.7 kWh lithium-ion
Market Intelligence
Real data from thousands of 7 Series 750e enquiries in 2025.
Most Common FailureBattery degradation and hybrid system issues
55%
of 750e enquiries
[PATTERN DATA]Average Enquiry Mileage
35,000
miles
[PATTERN DATA]Average Replacement Cost
£7,500
reconditioned, supply only
[PLACEHOLDER]Most Requested Engine Code
B58B30 + e-Motor
[BMW-VERIFIED]Peak Enquiry Season
Summer
Battery performance declines in heat; cooling system issues worsen
[PATTERN DATA]Regional Demand
- London
- 28%
- South East
- 22%
- South West
- 14%
- Other Regions
- 36%
Regional Demand Breakdown
Frequently Asked Questions
A reconditioned B58 engine for the 750e typically costs £6,000–£9,000 supply only. Fitting adds £1,200–£1,800. The hybrid system components (battery, electric motor) are additional costs if they need replacement. Main dealer new engines can exceed £22,000. Use our calculator for a figure specific to your car.
The B58 petrol engine is rated ★★★★☆ — it's one of BMW's most reliable modern engines. However, the 750e's plug-in hybrid system adds complexity: battery degradation is expected over time, and electric motor cooling issues can occur. The B58 itself is well-proven and reliable.
Battery degradation (range loss), electric motor and charging system issues, and B58 cooling system failures are the most common. The B58 itself is reliable, but the hybrid system demands specialist attention.
Against a £60,000–£100,000+ 750e, a £7,500 recon engine is a manageable 7–12% of the vehicle's value — worth it. Given the G70's strong retained values, replacement is almost always viable. However, if the hybrid battery also needs replacement (£8,000–£15,000), assess carefully.
Listed on the VIN plate and vehicle documentation. The 750e uses the B58 3.0-litre petrol engine combined with an electric motor. The badge signifies the plug-in hybrid model. Tell us your registration date and we'll confirm it for free.
The hybrid battery is separate from the engine. Cell-level replacement or module replacement is possible, costing £3,000–£6,000. If the entire battery pack needs replacement, it's significantly more expensive (£8,000–£15,000). BMW's 8-year/100,000-mile battery warranty provides some protection. The engine itself (B58) is not normally replaced for battery issues.
Disclaimer: 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.
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