How much does a BMW 545e engine replacement cost in the UK?

A reconditioned B58B30C engine typically costs £4,000–£6,500 supply only, with used units available from £3,000–£5,000. Fitting adds £1,500–£2,500 depending on the workshop. Note that the hybrid battery is a separate component - replacement costs £3,000–£8,000. Use our calculator for a figure specific to your car.

Is the BMW 545e engine reliable?

Yes - the B58 is widely regarded as one of BMW's most reliable modern engines. The 545e's B58 is the same engine used in the 540i and Toyota Supra. The main concerns are the cooling system (water pump, hoses) and battery degradation over time. With good maintenance, the engine itself is exceptionally durable.

What are the common problems with the BMW 545e?

Cooling system leaks and water pump failure, high-voltage battery degradation (reduced electric range after 5–8 years), and oil filter housing leaks. The B58 is fundamentally robust - these are maintenance items, not catastrophic design flaws.

Is it worth replacing a BMW 545e engine, or should I scrap the car?

545e values remain strong - a well-kept G30 LCI is often worth £20,000–£35,000+. A £4,000–£6,500 reconditioned engine is only 15–25% of the vehicle's value - well within the 70% BMW threshold. However, if the hybrid battery also needs replacing, total costs can approach 40–50% of the car's value. Evaluate both components before deciding.

How do I find my BMW 545e engine code?

The engine code is B58B30C - it's the only engine used in the G30 LCI 545e (2020–2023). You can find it on the VIN plate, in the vehicle documentation, or on a label on the engine itself. Production ended in 2023.

Can I replace just the hybrid battery, or does it need the engine?

The hybrid battery is a separate component from the engine - it can be replaced independently. Battery replacement costs £3,000–£8,000 depending on whether you need cell module replacement or a full battery pack. BMW's battery warranty typically covers 8 years / 100,000 miles in the UK - check if your car is still covered.

BMW 5 Series 545e2020–20233.0-litre Plug-in Hybrid

BMW 545e Engine Replacement — Compare Prices & Get Quotes

The 545e combines BMW's legendary B58 straight-six with an electric motor for 394 hp and 600 Nm of torque - 0–62 mph in 4.6 seconds with up to 33 miles of electric range. It's the most powerful plug-in hybrid 5 Series ever built. Get quotes from UK specialists for reconditioned, rebuilt and used units today.

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BMW 545e Engines - from £3,000 to £8,000Code: B58B30C

BMW 545e Engines - from £3,000 to £8,000· Code: B58B30C

Instant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide Network

The 545e THROUGH TIME - Era Map

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

GenerationYearsEngine CodeReliabilityRecon CostEra Note

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 UK Cost Data

Verified Reliability

Expert Insights

Updated for 2025

BMW 545e Engine Replacement Costs

Supply Only£4,000–£6,500

Fitted (Indie)£5,500–£8,000

Warranty12–24 months

Best ForMost owners - best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£3,000–£5,000£4,500–£6,5001–6 monthsBudget priority; lower‑mileage examples

Reconditioned Engine£4,000–£6,500£5,500–£8,00012–24 monthsMost owners - best cost/warranty balance

Rebuilt Engine£5,500–£8,000£7,000–£9,50012–24 monthsLong‑term ownership; 3+ year horizon

Main Dealer New£7,000–£10,000£8,500–£12,00024–36 monthsInsurance jobs, warranty claims

Figures above reflect the current 545e market. Note that these figures are for the combustion engine only - the hybrid battery is a separate component (see FAQ). Used B58 engines from the 545e are relatively scarce due to the model's limited production run.

Labour estimate: Fitting a 545e engine typically takes 12–16 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer). The hybrid system adds complexity - ensure your chosen specialist has PHEV experience.

→ Compare 545e engine prices from UK specialists

Common Problems With BMW 320d Engines

1. Cooling System Leaks (Water Pump and Hoses)

Symptoms: Coolant loss with no visible external leak, rising temperature gauge, warning light, steam from the engine bay, heater not working properly

Typical mileage: 60,000–100,000 miles

Repair cost: £500–£1,200 (water pump replacement)

Replacement cost: N/A - repair only

🟠 Check - book inspection urgently

Our recommendation:

The B58's cooling system is its most common weak point. The water pump can fail, and the plastic coolant hoses can become brittle. The 545e's hybrid system adds extra cooling complexity, making regular inspection essential. Replace the water pump preventatively at around 60,000–80,000 miles. Check coolant levels regularly and investigate any drop immediately.

Read the full coolant leak guide

1. Cooling System Leaks (Water Pump and Hoses)

Symptoms: Coolant loss with no visible external leak, rising temperature gauge, warning light, steam from the engine bay, heater not working properly

Typical mileage: 60,000–100,000 miles

Repair cost: £500–£1,200 (water pump replacement)

Replacement cost: N/A - repair only

🟠 Check - book inspection urgently

Our recommendation:

Read the full coolant leak guide

2. High-Voltage Battery Degradation

Symptoms: Reduced electric range, longer charging times, warning lights, reduced power in EV mode, battery management system errors

Typical mileage: 50,000–100,000 miles (age-related, typically 5–8 years)

Repair cost: £3,000–£8,000 (battery replacement or cell module replacement)

Replacement cost: N/A - repair only (battery replacement is separate from engine replacement)

🟡 Monitor - book inspection soon

Our recommendation:

Like all PHEVs, the 545e's 11.6 kWh battery will degrade over time. Battery capacity loss typically becomes noticeable after 5–7 years or 100,000 km. Symptoms include reduced electric range and longer charging times. BMW's battery management system is sophisticated, but regular use and avoiding frequent 100% charges can extend battery life. If you notice significant range loss, have the battery health checked by a BMW specialist. Note that battery replacement is separate from engine replacement - and can be costly.

Read the full hybrid battery failure guide

3. Oil Filter Housing Leaks

Symptoms: Oil spots under the car, burning oil smell from the engine bay, low oil pressure warning, coolant loss, engine warning light

Typical mileage: 60,000–100,000 miles

Repair cost: £800–£1,800 (oil filter housing replacement, including intake manifold removal)

Replacement cost: N/A - repair only

🟠 Check - book inspection urgently

Our recommendation:

The B58's oil filter housing is a known weak point. The housing can crack, causing coolant or oil leaks. Because it sits under the intake manifold, replacement is labour-intensive. Check for oil spots regularly and investigate any drop in fluid levels promptly.

Read the full oil filter housing failure guide

Weighing Your Options?

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545e - 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.

545e - 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 SenseWater pump/cooling system leak✅ Yes£500–£1,200Straightforward replacement - catch before overheatingOil filter housing crack✅ Yes£800–£1,800Labour-intensive but well-understood; once replaced, issue rarely recursHybrid battery degradation✅ Yes£3,000–£8,000Cell module replacement or full battery replacement - expensive but cheaper than a new carTiming chain wear (rare)✅ Yes£1,200–£2,500The B58 is far more reliable than earlier chains - but tensioners can still wearEngine failure (catastrophic)❌ Usually NoEngine replacementRare on the B58 - but if it happens, replacement is the only option

Buying This 545e? Check These First

Buy If

Full service history with correct BMW-spec oil - the B58 is reliable but unforgiving of neglect
Evidence of cooling system maintenance - water pump or hoses replaced
Battery health report - ask the seller for a battery capacity test
A well-maintained example where the previous owner understood the PHEV's unique requirements

Avoid If

Evidence of repeated coolant top-ups without a diagnosed leak - the cooling system is the B58's Achilles' heel
Reduced electric range compared to factory figures - battery degradation may be advanced
Poor service history - these engines are sensitive to oil quality
Any engine warning light without a clear diagnosis
No evidence of battery health checks - PHEV batteries are expensive to replace

Closing Verdict

The 545e is a genuinely remarkable car - combining the B58's legendary smoothness and tunability with electric efficiency. The engine itself is one of BMW's most reliable, but the hybrid system adds complexity. Battery degradation is the main long-term concern - budget for it at around 8–10 years. Buy on history, maintain on schedule, and the 545e will reward you with performance and efficiency that few cars can match.

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

→ Compare 545e 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 545e engine prices before you buy

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Buying Checklist

Before you buy a used BMW 545e (or before you commit to an engine replacement), check these:

1. Coolant Level

Any unexplained loss? (cooling system warning)

2. Service History

including evidence of cooling system maintenance and oil changes

3. Battery Health

Ask for a battery capacity test or health report

4. Electric Range

Does it match the expected 30+ miles? (range loss indicates battery degradation)

5. Oil Spots

Any oil under the car? (oil filter housing or valve cover leak warning)

6. Cold Start

Any rattles? (timing chain issues are rare on B58 but possible)

7. Charging Behaviour

Does it charge normally? Any charging errors?

8. MOT History

Check for emissions-related failures

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 - one engine throughout this badge's production run.

B58B30C

Years2020–2023

Power394 hp (combined)

2025 Enquiries[PATTERN DATA]

Avg. Recon Cost£4,000–£6,500 [BMW-QUOTE]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

B58B30C2020–2023394 hp (combined)[PATTERN DATA]£4,000–£6,500 [BMW-QUOTE]

Technical Specs

B58B30C - 545e

Displacement2,998cc (3.0-litre)

CylindersStraight-6

Compression Ratio11.0:1

Fuel SystemDirect injection

TurbochargerSingle twin-scroll turbocharger

ValvetrainDOHC, 4 valves per cylinder, Valvetronic, Double-VANOS

Electric Motor109 hp (combined system output: 394 hp)

Battery11.6 kWh lithium-ion

→ Compare 545e engine prices for your BMW

Get quotes from trusted UK specialists in minutes.

Market Intelligence

Most Common Failure

Cooling system leaks and water pump failure

the primary weakness of the B58

Average Enquiry Mileage

40,000

–70,000 miles【PATTERN DATA】

Average Replacement Cost

£4,000

–£6,500 reconditioned, supply only【BMW-QUOTE】

Most Requested Engine Code

B58B30C

the 545e's hybrid B58【PATTERN DATA】

Peak Enquiry Season

Spring

pre‑summer vehicle preparation【PATTERN DATA】

Regional Demand

London22%

South East18%

South West (14%)【PATTERN DATA】

Regional Demand Breakdown

22%London

18%South East

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.

Trusted 545e Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real 545e owners, as part of the Engine Finders network, across the G30 LCI generation.
Compare 545e Engine Replacement Companies
see prices, warranty terms and supply & fit options side‑by‑side before you commit, with specialists who genuinely understand the B58's cooling system and the PHEV's unique requirements.
UK Engine Replacement Services for 545e
supply‑only or full supply & fit available nationwide, covering BMW's most powerful plug-in hybrid 5 Series with a 12‑month warranty as standard.

Find the best BMW 545e engine replacement UK drivers rely on. Compare prices from trusted specialists on EnginesMarket today and keep your B58-powered hybrid performing at its best.

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100% Free

No hidden fees

No Obligation

Get quotes with zero pressure

UK Specialists

20+ vetted experts

12-Month Warranty

As standard

Nationwide Delivery

Supply & fit available