How much does a BMW 3 Series 320e engine replacement cost in the UK?

A reconditioned 320e engine (B48B20A with hybrid system) typically costs £2,500‑£3,800 supply only. Fitting adds £1,000‑£1,500. As a PHEV, the hybrid system components add complexity and cost. Use our calculator for a figure specific to your vehicle.

Is the BMW 3 Series 320e engine reliable?

The B48 is a robust and refined engine – the timing chain issues that plagued the N20 are not a documented concern on the B48. However, the plug‑in hybrid system adds complexity. HV battery degradation and charging system failures are the primary concerns. With regular maintenance and proper battery care, the 320e can be a reliable and efficient powertrain.

What are the common problems with the BMW 3 Series 320e?

The most common issues are PHEV‑specific: HV battery degradation (reduced electric range), KLE module/charging system failure, and premature brake wear due to the vehicle's weight. The B48 engine itself is generally reliable, though oil leaks (valve cover, oil filter housing) can occur.

Is it worth replacing a 320e engine, or should I scrap the car?

Given the 3 Series's retained value (typically £15,000‑£35,000+), a £2,500‑£4,800 reconditioned engine is a significant but often justifiable expense. 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 – if the rest of the vehicle is in good condition, replacement is usually the better option.

How do I find my 3 Series's engine code?

The 320e uses the B48B20A 2.0‑litre turbo petrol engine combined with an 80 kW electric motor. This is stamped on the engine block and listed on your V5C. The 320e badge itself confirms the powertrain – it's the 204 PS plug‑in hybrid offered in the G20 3 Series from 2021 onwards.

Can I repair a 320e engine issue, or does it need replacement?

Most issues – oil leaks, charging system failures, brake wear – 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 3 Series 320e2021–present2.0L Turbo PHEV (B48B20A + e-motor)

BMW 3 Series 320e Engine Replacement — Compare Prices & Get Quotes

Name: BMW 3 Series 320e UK Engine Enquiry Data 2025
Creator: BMWEngines.uk

Get quotes today from trusted UK BMW specialists. Compare reconditioned, rebuilt and used B48 2.0-litre turbo plug-in hybrid powertrains for the 3 Series 320e - the efficient, refined entry point to BMW's electrified 3 Series range. Supply & fit available nationwide.

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BMW 3 Series 320e Engines - from £1,500 to £4,800Powertrain: B48B20A 2.0L Turbo PHEV

BMW 3 Series 320e Engines - from £1,500 to £4,800· Powertrain: B48B20A 2.0L Turbo PHEV

Instant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK‑Wide Network

BMW 3 Series 320e - Which Powertrain Does Your Car Actually Have?

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

Era Note

204 PS, 350 Nm - B48 robust, hybrid system adds complexity, 12 kWh battery

GenerationYearsEngine CodeReliabilityRecon CostEra Note

G20

2021–presentB48B20A (2.0L Turbo PHEV) + 80 kW e‑motor★★★★☆ [NEWLY ASSIGNED - see Data Note]£2,800–£4,200 [PLACEHOLDER - confirm vs cost sheet]204 PS, 350 Nm - B48 robust, hybrid system adds complexity, 12 kWh battery

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 3 Series 320e Engine Replacement Costs

Supply Only£2,500–£3,800

Fitted (Indie)£3,500–£5,000

Warranty12–24 months

Best ForMost owners - best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£1,500–£2,500£2,300–£3,8001–6 monthsBudget priority; lower‑mileage salvage units

Reconditioned Engine£2,500–£3,800£3,500–£5,00012–24 monthsMost owners - best cost/warranty balance

Rebuilt Engine£3,500–£4,800£4,800–£6,20012–24 monthsLong‑term ownership; maximum reliability

Main Dealer New£5,500–£7,500£7,000–£9,50024–36 monthsInsurance jobs; warranty claims; full provenance

Figures above reflect the G20 320e 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 320e engine typically takes 12‑16 hours at £75‑£110/hr (independent BMW specialist). Hybrid system integration adds to the complexity.

→ Compare 3 Series 320e engine prices from UK specialists

Common Problems With BMW 320d Engines

1. HV (High‑Voltage) Battery Degradation

Symptoms: Reduced electric‑only range (noted drop from 33‑38 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 320e'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. Some owners report that the 320e's hybrid system is less sophisticated than competitors' offerings, and battery degradation can be a concern on higher‑mileage examples.

1. HV (High‑Voltage) Battery Degradation

Symptoms: Reduced electric‑only range (noted drop from 33‑38 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:

2. 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 320e won't charge, don't ignore it - the car will run on petrol only, negating the benefits of the hybrid system.

3. Brake Wear (Regenerative Braking & Weight)

Symptoms: Squealing brakes, reduced braking performance, warning lights, high brake pad wear.

Typical mileage: 20,000‑40,000 miles (the 320e's 1,845 kg kerb weight places extra stress on brakes).

Repair cost: £300‑£800 [PLACEHOLDER] (brake pad and disc replacement).

Replacement cost: N/A - repair only.

🟡 Monitor - book inspection soon if brake wear is noted.

Our recommendation:

The 320e is a heavy car - the battery adds significant weight. Premature wear of brakes and suspension is a common issue on PHEVs. Regular brake inspections are essential, and you should budget for more frequent brake replacements than on a conventional 3 Series. The regenerative braking system can also cause uneven pad wear.

4. B48 Engine Oil Leaks (Valve Cover / Oil Filter Housing)

Symptoms: Oil spots under the vehicle, burning oil smell, low oil level warning, visible oil leak from the top or front of the engine.

Typical mileage: 40,000‑80,000 miles.

Repair cost: £300‑£800 [PLACEHOLDER] (valve cover gasket or oil filter housing gasket replacement).

Replacement cost: N/A - repair only.

🟠 Check - book inspection urgently if oil leak is detected.

Our recommendation:

The B48 is a robust engine, but oil leaks from the valve cover gasket and oil filter housing are not uncommon. If the oil filter housing gasket fails, oil can leak onto the serpentine belt, causing it to slip or break - which can then be ingested into the engine through the front crankshaft seal, causing catastrophic failure. If you notice oil spots under your 320e or a burning oil smell, investigate immediately.

Weighing Your Options?

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BMW 3 Series 320e - 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 3 Series 320e - 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 SenseHV 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 PHEVBrake wear✅ Yes£300‑£800 [PLACEHOLDER]Routine maintenance - always worth doingOil leaks✅ Yes£300‑£800 [PLACEHOLDER]Essential maintenance - always worth doingMajor internal engine failure❌ Usually No£2,500‑£4,800+Full engine replacement often more cost‑effective

Buying This BMW 3 Series 320e? 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 320e 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
Poor service history - these vehicles demand strict maintenance
Any sign of oil leaks - the B48 is robust, but oil leaks are a known issue

Closing Verdict

The BMW 320e is a compelling entry‑level plug‑in hybrid - combining the proven B48 2.0‑litre turbo petrol engine with an 80 kW electric motor for 204 PS and 350 Nm. It offers genuine electric‑only capability for short commutes (up to 38 miles) and excellent fuel economy when charged regularly. However, PHEV complexity brings potential issues - battery degradation, charging system failures, and the extra weight placing stress on brakes and suspension. 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 3 Series 320e 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 3 Series 320e engine prices before you buy

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Buying Checklist

Before you buy a used BMW 3 Series 320e (or before you commit to an engine replacement), check these:

1. Electric Range

Does the displayed range match expectations? (32‑38 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. Oil Leaks

Check under the vehicle and around the valve cover and oil filter housing

6. Brake Condition

Any squealing or wear? (the 320e is heavy on brakes)

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.

B48B20A + 80 kW e‑motor

Years2021–present

Power204 PS (150 kW) / 350 Nm

2025 Enquiries- (pattern data)

Avg. Recon Cost£2,500–£3,800 [PLACEHOLDER]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

B48B20A + 80 kW e‑motor2021–present204 PS (150 kW) / 350 Nm- (pattern data)£2,500–£3,800 [PLACEHOLDER]

Technical Specs

B48B20A PHEV Powertrain

Displacement1,998 cc

Cylinders4‑cylinder inline

Compression Ratio11.0:1

Fuel SystemDirect injection

AspirationTwin‑power turbocharger

ValvetrainVALVETRONIC

Electric Motor80 kW (109 PS) / 265 Nm

Battery12 kWh lithium‑ion

Transmission8‑speed Steptronic automatic

→ Compare 3 Series 320e engine prices for your BMW

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Market Intelligence

Most Common Failure

HV battery degradation / KLE charging module failure

PHEV‑specific issues

Average Enquiry Mileage

20,000

‑40,000 miles

[PATTERN DATA]

Average Replacement Cost

£3,000

reconditioned, supply only

[PLACEHOLDER]

Most Requested Engine Code

B48B20A

sole 320e PHEV powertrain

[PATTERN DATA]

Peak Enquiry Season

Spring/Summer

new model year interest

[PATTERN DATA]

Regional Demand

South East20%

London18%

South West (12%) - premium hybrid strongholds

PATTERN DATA

Regional Demand Breakdown

20%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 3 Series 320e Owners Trust BMWEngines.uk

Trusted 320e Powertrain Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real 3 Series owners, as part of the Engine Finders network, covering the B48 plug‑in hybrid powertrain with specialist knowledge of PHEV systems, battery health, and charging electronics.
Compare 320e Replacement Companies
see prices, warranty terms and supply & fit options side‑by‑side before you commit, with specialists who understand the B48's reliability, the hybrid system's complexities, and the importance of HV battery health checks.
UK Engine Replacement Services for the 3 Series Hybrid
supply‑only or full supply & fit available nationwide, covering the G20 320e from 2021 onwards, with specialist knowledge of BMW's PHEV technology and the B48 engine family.

Find the best BMW 3 Series 320e 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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