BMW 3 Series 320e2021–present2.0L Turbo PHEV (B48B20A + e-motor)

BMW 3 Series 320e Engine Replacement —Compare Prices &
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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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Supply &Fit Available
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BMW 3 Series 320e Engines — from £1,500 to £4,800Powertrain: B48B20A 2.0L Turbo PHEV

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

One generation. One era. One guide to reliability, costs and what really matters.

Era Note

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

Generation	Years	Engine Code	Reliability	Recon Cost (Guide)	Era Note
G20	2021–present	B48B20A(2.0L Turbo PHEV)+ 80 kW e‑motor		£2,800–£4,200[PLACEHOLDER]	204 PS, 350 Nm — B48 robust, hybrid system adds complexity, 12 kWh battery

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 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 Type	Supply Only	Fitted (Indie)	Warranty	Best For
Used Engine	£1,500 – £2,500	£2,300 – £3,800	1–6 months	Budget priority; lower‑mileage salvage units
Reconditioned Engine	£2,500 – £3,800	£3,500 – £5,000	12–24 months	Most owners — best cost/warranty balance
Rebuilt Engine	£3,500 – £4,800	£4,800 – £6,200	12–24 months	Long‑term ownership; maximum reliability
Main Dealer New	£5,500 – £7,500	£7,000 – £9,500	24–36 months	Insurance 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.

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Common Problems With BMW 3 Series 320e 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).
Urgency: 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).
Urgency: 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.
Urgency: 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.
Urgency: 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.
Urgency: 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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20+ vetted BMW specialists, covering the 320e B48 plug‑in hybrid powertrain, with a 12‑month warranty as standard.

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3 Series 320e — 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
HV battery degradation	Sometimes	£2,000‑£5,000+[PLACEHOLDER]	May be covered under warranty; if not, assess cost vs. vehicle value
KLE module / charging system	Yes	£800‑£2,000[PLACEHOLDER]	Worth fixing — the car needs to charge to be a PHEV
Brake wear	Yes	£300‑£800[PLACEHOLDER]	Routine maintenance — always worth doing
Oil leaks	Yes	£300‑£800[PLACEHOLDER]	Essential maintenance — always worth doing
Major internal engine failure	Usually No	£2,500‑£4,800+	Full engine replacement often more cost‑effective

ProblemRepairable? · Typical Cost

HV battery degradation

Sometimes£2,000‑£5,000+[PLACEHOLDER]

May be covered under warranty; if not, assess cost vs. vehicle value

KLE module / charging system

Yes£800‑£2,000[PLACEHOLDER]

Worth fixing — the car needs to charge to be a PHEV

Brake wear

Yes£300‑£800[PLACEHOLDER]

Routine maintenance — always worth doing

Oil leaks

Yes£300‑£800[PLACEHOLDER]

Essential maintenance — always worth doing

Major 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. Compare.

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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

Why this matters

A 10-minute check now can save you thousands later. The right 3 Series 320e is a superb long-term car — the wrong one can be expensive fast.

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 3 Series 320e pitfalls.

Engine Codes

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

B48B20A + 80 kW e‑motor

Years: 2021–present
Power: 204 PS (150 kW) / 350 Nm
2025 Enquiries: —(pattern data)
Avg. Recon Cost: £2,500–£3,800[PLACEHOLDER]

Engine Code	Years	Power	2025 Enquiries	Avg. Recon Cost
B48B20A + 80 kW e‑motor	2021–present	204 PS (150 kW) / 350 Nm	—(pattern data)	£2,500–£3,800[PLACEHOLDER]

Technical SpecsB48B20A PHEV Powertrain

Displacement: 1,998 cc
Cylinders: 4‑cylinder inline
Compression Ratio: 11.0:1
Fuel System: Direct injection
Aspiration: Twin‑power turbocharger
Valvetrain: VALVETRONIC
Electric Motor: 80 kW (109 PS) / 265 Nm
Battery: 12 kWh lithium‑ion
Transmission: 8‑speed Steptronic automatic

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Market Intelligence

Real data from thousands of 3 Series 320e enquiries in 2025.

Most Common FailureHV 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 East: 20%
London: 18%
Other Regions: 62%

[PATTERN DATA]

Regional Demand Breakdown

18%London20%South East62%Other Regions

Frequently Asked Questions

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.

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.

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.

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.

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.

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.

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.

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.

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

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

BMW 3 Series 320e Engine Replacement Costs

Common Problems With BMW 3 Series 320e Engines

1. HV (High‑Voltage) Battery Degradation

2. Charging System / KLE Module Failure

3. Brake Wear(Regenerative Braking & Weight)

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

1. HV (High‑Voltage) Battery Degradation

2. Charging System / KLE Module Failure

3. Brake Wear(Regenerative Braking & Weight)

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

Weighing Your Options?

3 Series 320e — Repair, Buy, or Replace?

Can It Be Repaired?

Buying This BMW 3 Series 320e? Check These First

Buying Checklist

Buying Checklist

Engine Codes

Market Intelligence

Regional Demand Breakdown

Frequently Asked Questions

Why UK BMW 3 Series 320e Owners Trust BMWEngines.uk

Trusted 320e Powertrain Suppliers

Compare 320e Replacement Companies

UK Engine Replacement Services for the 3 Series Hybrid

BMW 3 Series 320e Engine Replacement —Compare Prices &
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