BMW 7 Series 745e Engine ReplacementCompare Prices & Get Quotes
Get free, no-obligation quotes today from trusted UK BMW 7 Series 745e engine specialists. Compare prices on reconditioned, rebuilt and used B58B30C plug-in hybrid engines for G11 and G12 745e models.
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From £5,000 to £8,000
Used from £3,500 · Reconditioned from £5,000 · Common codes: B58B30C, B58B30M0
From £3,500
Tested, bare/short engine
From £5,000
Rod bearings addressed, tested
From quote
Upgraded bearings, full teardown, revised valvetrain
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3 Simple Steps3 Simple Stepsto Finding the Best BMW 7 Series 745e Replacement Engineto Finding the Best BMW 7 Series 745e Replacement Engine
Most replacements completed within 3-5 days.
Variant HistoryBMW 7 Series 745e - Engine History & Specs at a Glance
The BMW 745e debuted in 2019 as part of the G11/G12 7 Series Life Cycle Impulse (LCI) update, replacing the four-cylinder 740e with a more powerful six-cylinder plug-in hybrid powertrain. It paired BMW's renowned B58 3.0-litre turbocharged straight-six with an electric motor, offering a compelling blend of luxury, performance and efficiency.
Variant HistoryBMW 7 Series 745e - Engine History & Specs at a Glance
The BMW 745e debuted in 2019 as part of the G11/G12 7 Series Life Cycle Impulse (LCI) update, replacing the four-cylinder 740e with a more powerful six-cylinder plug-in hybrid powertrain. It paired BMW's renowned B58 3.0-litre turbocharged straight-six with an electric motor, offering a compelling blend of luxury, performance and efficiency.
BMW 7 Series 745e
Fuel TypePetrol / Plug-in Hybrid (PHEV)
Engine Size3.0L (2,997 cc)
Combustion Power286 hp (210 kW) @ 5,000 rpmEngine History Timeline
B58B30C 3.0-litre inline-six turbo petrol + electric motor, 286 hp (210 kW) combustion + 113 hp electric, 394 hp system output, G11/G12 LCI launch
745Le (long wheelbase) and 745Le xDrive variants introduced alongside standard 745e
B58B30M0 variant introduced for xDrive models with revised hybrid calibration
Production ends (February 2022); replaced by G70-generation 750e xDrive
Key Specs Snapshot
Fuel TypePetrol / Plug-in Hybrid (PHEV)Engine Size3.0L (2,997 cc)Combustion Power286 hp (210 kW) @ 5,000 rpmElectric Motor Power113 hp (83 kW)System Power394 hp (290 kW)Torque450 Nm @ 1,500-3,500 rpmElectric Range34-36 miles (WLTP)0-62 mph5.2 seconds (745e), 5.1 seconds (745Le xDrive)Years Produced2019-2022Every engine fitted to the BMW 7 Series 745e is covered below, with UK rebuilt pricing and known failure points.
BMW 7 Series 745e Engine Codes - Specifications & Replacement CostBMW 7 Series 745e Engine Codes - Specifications & Replacement Cost
3.0L Inline-Six Turbo PHEV (2019-2022)
Power Output (Combustion)286 hp (210 kW) @ 5,000 rpmTorque450 Nm @ 1,500-3,500 rpmElectric Motor113 hp (83 kW) PSM permanent magnet synchronous motorSystem Power394 hp (290 kW)Years Fitted2019-2022ChassisG11 (standard wheelbase), G12 (long wheelbase)Displacement2,997 ccFuel SystemDirect injectionTransmission8-speed automatic (ZF 8HP)
Compatible Trim Levels
- 745e
- 745e M Sport
- 745e Pure Excellence
- 745Le
- 745Le xDrive
Find your exact engine code, specs and UK replacement cost guide.
Used
Tested, ready-to-fit engine
£3,500-£5,500
Reconditioned
Addressed known issues, tested
£5,000-£6,500
Rebuilt
Full teardown, upgraded internals
£5,500-£8,000
Common Failure
The B58 is widely regarded as BMW's most reliable modern engine, but the 745e's hybrid integration introduces additional complexity.Coolant system leaks from the water pump, expansion tank and thermostat housing are the most frequently reported issues.Some owners have reported excessive oil consumption, which may indicate PCV valve or valve stem seal wear.The high-voltage hybrid battery (12 kWh) can degrade over time, reducing electric range - replacement costs are substantial.
The BMW 745e is powered by the B58B30C - one of BMW's most robust modern engines - paired with a plug-in hybrid system. While the B58 is significantly more reliable than older BMW turbo engines, it has a few well-documented weak points, primarily around the cooling system.Rebuilt B58B30C engines supplied through EnginesMarket include upgraded cooling system components, fresh gaskets and seals, and a minimum 12-month unlimited-mileage warranty.
Why the BMW 7 Series 745e B58B30C Loses Coolant
Affected Vehicles
BMW 7 Series 745e (B58B30C/B58B30M0, 2019-2022)
Typical Failure Mileage
50,000-80,000 miles
Root Cause
The B58's plastic water pump, expansion tank and thermostat housing can develop cracks over time due to heat cycling. Coolant leaks are the most frequently reported issue across the B58 family.
Why It Happens
The B58's plastic water pump, expansion tank and thermostat housing can develop cracks over time due to heat cycling. Coolant leaks are the most frequently reported issue across the B58 family.
Dealer (parts + labour)
£900-£1,400
Specialist (parts + labour)
£600-£950
What it involves
Replace electric water pump, thermostat, coolant flush
Suitability
Preventative - do this before it fails
1 - 2 daysDealer (parts + labour)
£500-£800
Specialist (parts + labour)
£350-£600
What it involves
Replace cracked expansion tank, hoses, coolant
Suitability
If visible coolant loss or warning light
1 - 2 daysDealer (parts + labour)
£7,500-£10,500
Specialist (parts + labour)
£5,500-£8,000 (matches Section 4 rebuilt figure)
What it involves
Supply & fit, new water pump, thermostat, upgraded cooling components, 12-month warranty
Suitability
If overheating has caused head gasket or block damage
1 - 2 daysAll prices are indicative UK market ranges based on current UK specialist supplier data.| Repair Tier | Dealer (Parts + Labour) | Specialist (Parts + Labour) | What It Involves | Suitability | Estimated Time |
|---|---|---|---|---|---|
 Water pump replacement Minor | £900-£1,400 | £600-£950 | Replace electric water pump, thermostat, coolant flush | Preventative - do this before it fails | 1 - 2 days |
 Expansion tank and hose replacement Best Value | £500-£800 | £350-£600 | Replace cracked expansion tank, hoses, coolant | If visible coolant loss or warning light | 1 - 2 days |
Full Replacement - rebuilt/reconditioned engine Best Value | £7,500-£10,500 | £5,500-£8,000 (matches Section 4 rebuilt figure) | Supply & fit, new water pump, thermostat, upgraded cooling components, 12-month warranty | If overheating has caused head gasket or block damage | 1 - 2 days |
Vehicle Value Check
Vehicle Value Check
A typical 745e (2019-2022) is worth approximately £25,000-£45,000 depending on mileage, condition and whether it's a standard or long-wheelbase variant [THIRD-PARTY - Parkers/Auto Trader market observation]. - Vehicle worth under ~£5,000: repair or used engine typically makes more sense than a full rebuilt unit. - Vehicle worth ~£5,000-£8,000: evaluate both; reconditioned is viable if keeping the car 2+ years. - Vehicle worth ~£8,000-£15,000: reconditioned/rebuilt usually justifies the premium via warranty and reliability. - Vehicle worth £15,000+: replacement cost is typically small relative to vehicle value.
Our Recommendation
Our Recommendation
The B58's cooling system is its Achilles' heel - replace the water pump and expansion tank preventatively at around 60,000-70,000 miles if you're keeping the car. It's far cheaper than repairing an overheated engine. If your 745e has already overheated, get a compression test done immediately; if the head gasket is compromised, a rebuilt engine is the safest route.
Don't Let Engine Failure Write Off Your BMW 7 Series 745e
The B58-powered 745e is one of the most refined plug-in hybrids on the market, but coolant leaks, oil consumption and hybrid battery degradation can turn expensive quickly. A rebuilt engine through EnginesMarket addresses cooling system weaknesses with upgraded components and comes with a 12-month unlimited-mileage warranty. Compare quotes from UK specialists today and keep your 745e on the road for years to come.
Compare rebuilt B58B30C BMW 7 Series 745e engine prices
12-Month Minimum
UK Specialists Vetted
Best Price GuidanceImportant Information
Important Information
"All prices are indicative UK market ranges based on historical quote data and repair requests from our network of engine specialists. Dealer pricing is estimated based on published main dealer labour rates and genuine OEM parts pricing. Specialist pricing reflects actual quote data from EnginesMarket's UK network. Actual costs vary depending on damage severity, vehicle condition, variant, and workshop location within the UK. Use our free comparison tool to get tailored quotes for your specific BMW 7 Series 745e. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier."
BMW 7 Series 745e Engine ReplacementFrequently Asked Questions
Question 1How much does a BMW 745e engine replacement cost in the UK-
A replacement B58B30C engine for a BMW 745e typically costs £3,500-£5,500 for a used unit, £5,000-£6,500 for a reconditioned unit, and £5,500-£8,000 for a fully rebuilt engine with a 12-month warranty.Supply and fit adds approximately £780-£1,040 in specialist labour (12-16 hours at £65/hr). The hybrid system's additional complexity may add to labour time.
- Used engines: lowest cost, variable condition and mileage
- Reconditioned engines: restored to OEM tolerances, balanced cost and reliability
- Rebuilt engines: fully stripped and rebuilt with new components, best warranty
Question 2What are the signs of B58 coolant system failure in a 745e-
The most common signs are a low coolant warning light, visible coolant puddles under the car, and engine overheating. Other symptoms include:
- Sweet smell from the engine bay (coolant odour)
- Fluctuating temperature gauge
- White steam from under the bonnet
- Reduced heater performance
Question 3Is it worth replacing the engine in a BMW 745e-
A typical 745e is worth £25,000-£45,000, making a rebuilt engine (£5,500-£8,000) a sound investment if the car is otherwise in good condition. The 745e's high retained value compared to older 7 Series models means replacement is almost always financially viable.
- Check MOT history and bodywork before committing
- Low-mileage, well-maintained examples justify the investment
- LWB (745Le) and xDrive variants hold value better
Question 4How long does a BMW 745e engine replacement take-
Most BMW 745e engine replacements take 2-4 days for supply and fit at a specialist garage. The B58 is a relatively straightforward engine to remove and refit, but the hybrid system adds complexity. Allow additional time if the car requires:
- Cooling system components (water pump, thermostat, expansion tank)
- High-voltage battery system checks
- xDrive drivetrain components (xDrive models)
- Collection and delivery (1-2 days depending on location)
Question 5Do BMW 745e replacement engines come with a warranty-
Yes - all rebuilt and reconditioned BMW 745e engines supplied through EnginesMarket include a minimum 12-month unlimited-mileage warranty. Used engines typically have a 3-6 month warranty depending on the supplier. Extended warranty options are available with some specialists.
- Rebuilt engines: 12-24 month warranty, unlimited mileage
- Reconditioned engines: 12-month warranty, unlimited mileage
- Used engines: 3-6 month warranty, mileage-dependent
Question 6What's the difference between the 745e and the 740e-
The 740e (2016-2019) used a 2.0-litre four-cylinder turbo engine (B48) paired with an electric motor, producing 326 hp. The 745e (2019-2022) replaced it with a 3.0-litre six-cylinder B58, producing 394 hp - a significant upgrade in power, refinement and performance.
- 740e: 2.0L four-cylinder, 326 hp, produced 2016-2019
- 745e: 3.0L six-cylinder, 394 hp, produced 2019-2022
- The 745e is quicker (5.2s vs 5.4s 0-62 mph) and more refined
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