BMW 4 Series M440d2020–present1 Engine Generation

BMW M440d Engine Replacement —Compare Prices &
Get Quotes

Name: BMW M440d UK Engine Enquiry Data 2025
Creator: BMWEngines.uk

Get quotes today from trusted UK BMW M440d specialists. The 3.0-litre B57 twin-turbo inline-six diesel is BMW's most powerful six-cylinder diesel for the 4 Series — compare reconditioned, rebuilt and used engines with supply & fit available nationwide.

Supply &Fit Available
12-MonthWarranty
NationwideDelivery
20+Specialists

Supply &Fit Available
12-MonthWarranty
NationwideDelivery
20+Specialists

BMW M440d Engines — from £2,000 to £8,500Engine code: B57D30T2 (B57D30B)

Instant Quotes
No Obligation
100% Free
Reconditioned
Rebuilt
Used
Supply & Fit Available
UK-Wide Network

Instant Quotes
No Obligation
100% Free
Reconditioned
Rebuilt
Used
Supply & Fit Available
UK-Wide Network

BMW M440d — Which Engine Does Your Car Actually Have?

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

Era Note

3.0L twin-turbo inline-six diesel with 48V MHEV — 340 hp, 700 Nm. Chain durability notably improved over N57

Generation	Years	Engine Code	Reliability	Recon Cost (Guide)	Era Note
G22/G23/G26	2020–present	B57D30T2(B57D30B)		£4,000–£6,500[PLACEHOLDER]	3.0L twin-turbo inline-six diesel with 48V MHEV — 340 hp, 700 Nm. Chain durability notably improved over N57

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 M440d Engine Replacement Costs

Supply Only£4,000 – £6,500
Fitted (Indie)£6,000 – £8,500
Warranty12–24 months
Best ForMost owners — best cost/warranty balance

Engine Type	Supply Only	Fitted (Indie)	Warranty	Best For
Used Engine	£2,000 – £4,500	£3,000 – £6,000	1–6 months	Budget priority; lower-mileage donor
Reconditioned Engine	£4,000 – £6,500	£6,000 – £8,500	12–24 months	Most owners — best cost/warranty balance
Rebuilt Engine	£5,000 – £8,500	£7,000 – £10,500	12–24 months	Long-term ownership; 3+ year horizon
Main Dealer New	£14,000 – £18,000+	£16,000 – £20,000+	24–36 months	Insurance jobs, warranty claims

Labour estimate: Fitting an M440d engine typically takes 12–16 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer).

Compare M440d engine prices from UK specialists

Common Problems With BMW 4 Series M440d Engines

1. EGR Cooler Coolant Leak

Symptoms: Low coolant warning, coolant loss with no visible external leak, white exhaust smoke, rough idling, burning smell from engine bay, engine warning light
Typical Mileage: Any mileage — a global recall affects BMW diesel engines including B57-equipped models
Repair Cost: £0 (free under recall) / £600–£1,200 (out of warranty — EGR cooler replacement)
Replacement Cost: N/A — repair only (does not progress to engine replacement if addressed)
Urgency: Check — verify recall completion status immediately; coolant loss can cause serious engine damage

Our recommendation:

The EGR cooler is one of the most prevalent problems with the B57 engine. Coolant can seep into the intake system, causing white exhaust smoke, rough idling, or in worst cases, serious engine damage. BMW has issued multiple recalls affecting millions of diesel vehicles globally over EGR cooler faults that could cause coolant leaks and, in rare cases, fire risk. Verify recall completion before buying any M440d — this is a free fix at the dealership. If the vehicle is out of warranty and the recall wasn't performed, replacement costs can be significant.

Read the full EGR cooler failure guide /failures/egr-valve-cooler

1. EGR Cooler Coolant Leak

Symptoms: Low coolant warning, coolant loss with no visible external leak, white exhaust smoke, rough idling, burning smell from engine bay, engine warning light
Typical Mileage: Any mileage — a global recall affects BMW diesel engines including B57-equipped models
Repair Cost: £0 (free under recall) / £600–£1,200 (out of warranty — EGR cooler replacement)
Replacement Cost: N/A — repair only (does not progress to engine replacement if addressed)
Urgency: Check — verify recall completion status immediately; coolant loss can cause serious engine damage

Our recommendation:

Read the full EGR cooler failure guide /failures/egr-valve-cooler

2. DPF Clogging(Urban Driving)

Symptoms: DPF warning light, reduced performance, increased fuel consumption, "Drivetrain" warning message, limp mode
Typical Mileage: Any mileage — short urban journeys accelerate the issue
Repair Cost: £300–£800 (forced DPF regeneration) / £1,000–£2,500 (DPF replacement)
Replacement Cost: N/A — repair only (does not progress to engine replacement if addressed)
Urgency: Monitor — book inspection if warning appears

Our recommendation:

Like all modern diesels, the M440d's DPF is sensitive to short urban journeys that prevent the engine from reaching optimal temperatures for regeneration. If you primarily drive short distances, factor in regular motorway runs to allow passive DPF regenerations. Ignoring DPF warnings can lead to clogged filters, requiring expensive replacement. Some owners report that driving the car hard on the motorway can clear minor blockages — but if the warning persists, book a forced regeneration at a specialist.

Read the full DPF clogging guide /failures/dpf-blockage

3. Carbon Build-Up in Intake System

Symptoms: Reduced responsiveness, poorer fuel efficiency, hesitation on acceleration, rough idle
Typical Mileage: 60,000–100,000 miles — more common with frequent short trips
Repair Cost: £300–£800 (intake cleaning / walnut blasting)
Replacement Cost: N/A — repair only
Urgency: Monitor — book inspection if symptoms develop

Our recommendation:

If you're doing the majority of your driving in short distances or stop-and-go traffic, carbon buildup in the intake valves and manifold is a known issue. The engine may not reach the temperature needed to burn away oil vapour and soot, leading to clogging. Symptoms include reduced responsiveness, poorer fuel efficiency, and slower acceleration. Regular long journeys and using premium diesel can help mitigate this issue. If symptoms develop, an intake cleaning (walnut blasting) is the recommended solution.

Read the full carbon buildup guide → /failures/carbon-buildup-intake/ [NEW FAILURE PAGE NEEDED] /failures

4. Injector Wear

Symptoms: Rough idle, misfires, increased fuel consumption, black smoke from exhaust, engine warning light
Typical Mileage: 60,000–120,000 miles
Repair Cost: £400–£800 per injector (new Bosch injectors from £406.74 each)
Replacement Cost: N/A — repair only (does not progress to engine replacement if addressed)
Urgency: Monitor — book inspection if symptoms appear

Our recommendation:

The B57 uses Bosch common-rail diesel injectors that can wear over time. Symptoms include rough idle, misfires, and increased fuel consumption. A new Bosch injector for the B57D30B costs approximately £406.74 including VAT. If you experience rough running or black smoke, have the injectors tested and replaced as necessary. Catching injector wear early prevents more serious engine damage.

Read the full injector failure guide /failures/n57-injector-seal

Ready to Compare?

Get Matched With a Vetted BMW Specialist

20+ vetted BMW specialists, every M440d engine covered, with a 12-month warranty as standard.

Get My Free M440d Engine Quotes Now

M440d — 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
EGR cooler coolant leak	Yes	£0 (recall) / £600 – £1,200	Free under recall; straightforward replacement out of warranty
DPF clogging	Yes	£300 – £800	Forced regeneration or motorway run; replacement if severe
Carbon buildup (intake)	Yes	£300 – £800	Walnut blasting — restores performance
Injector wear	Yes	£400 – £800 each	Catch early to prevent engine damage
Timing chain failure	Usually No	Engine replacement	Rare on B57, but if it occurs, piston-valve contact means full replacement

ProblemRepairable? · Typical Cost

EGR cooler coolant leak

Yes£0 (recall) / £600 – £1,200

Free under recall; straightforward replacement out of warranty

DPF clogging

Yes£300 – £800

Forced regeneration or motorway run; replacement if severe

Carbon buildup (intake)

Yes£300 – £800

Walnut blasting — restores performance

Injector wear

Yes£400 – £800 each

Catch early to prevent engine damage

Timing chain failure

Usually NoEngine replacement

Rare on B57, but if it occurs, piston-valve contact means full replacement

Buying This M440d? Check These First

Buy if:

Full service history with BMW-approved oil (5W-30 or 0W-30 LL-04)
Confirmed EGR recall completion — this affects BMW diesel engines globally
Evidence of regular motorway use (DPF health)
Remaining manufacturer warranty — these are complex performance diesels

Avoid if:

No proof of EGR recall work — this is a free fix; lack of it suggests neglect
DPF warning lights or "Drivetrain" messages
Coolant loss with no documented fix — EGR cooler leaks are common
Poor service history — the B57 is reliable but needs proper maintenance

Closing verdict

The M440d's B57 is one of BMW's finest modern diesel engines — a 3.0-litre twin-turbo inline-six with 340 bhp and 700 Nm that delivers effortless performance and genuine character. It's widely regarded as "the golden mean between performance, consumption and longevity" and "probably one of the best engines BMW has ever produced". The B57 is a significant improvement over the N57 that preceded it — timing chain issues are "exceedingly rare". However, EGR cooler recalls, DPF sensitivity, carbon buildup, and injector wear are well-documented weaknesses. Buy with full service history, confirmed recall work, and evidence of regular long-distance driving — and you'll have one of the most rewarding performance diesels on the road.

Don’t Guess. Compare.

Get real quotes from vetted UK specialists and make the right call for your 4 Series M440d.

Compare M440d engine prices before you buy

20+ Vetted SpecialistsUK Network
12-Month Warrantyas Standard
Nationwide Delivery& Collection
Transparent PricingNo Hidden Fees
Thousands of 4 Series M440dOwners Helped

Buying Checklist

Before you buy a used BMW M440d (or before you commit to an engine replacement), check these:

1. EGR Recall
Verify EGR cooler recall completion — this is critical and affects BMW diesel engines globally
2. Cold Start
Listen for any unusual rattling or knocking (B57 timing chain is generally robust, but listen anyway)
3. DPF Health
Check for DPF warning lights; short journeys are a red flag
4. Service History
Including the B57 engine and confirmed BMW-approved oil changes (5W-30 / 0W-30 LL-04)
5. Coolant Level
Check for frequent top-ups; inspect for EGR cooler leaks
6. Injector Health
Any rough idle, misfires, or black smoke?
7. Engine Warning Light
Have codes been read? Look for EGR, DPF, or injector-related codes
8. MOT History
Check for emissions-related failures

Why this matters

A 10-minute check now can save you thousands later. The right 4 Series M440d is a superb long-term car — the wrong one can be expensive fast.

Buying Checklist

Before you buy a used BMW M440d (or before you commit to an engine replacement), check these:

1
EGR Recall
Verify EGR cooler recall completion — this is critical and affects BMW diesel engines globally
2
Cold Start
Listen for any unusual rattling or knocking (B57 timing chain is generally robust, but listen anyway)
3
DPF Health
Check for DPF warning lights; short journeys are a red flag
4
Service History
Including the B57 engine and confirmed BMW-approved oil changes (5W-30 / 0W-30 LL-04)
5
Coolant Level
Check for frequent top-ups; inspect for EGR cooler leaks
6
Injector Health
Any rough idle, misfires, or black smoke?
7
Engine Warning Light
Have codes been read? Look for EGR, DPF, or injector-related codes
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 4 Series M440d pitfalls.

Engine Codes

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

B57D30T2 (B57D30B)

Years: 2020–present
Power: 340 bhp (250 kW) / 700 Nm
2025 Enquiries: —(pattern data)
Avg. Recon Cost: £4,000–£6,500[PLACEHOLDER]

Engine Code	Years	Power	2025 Enquiries	Avg. Recon Cost
B57D30T2 (B57D30B)	2020–present	340 bhp (250 kW) / 700 Nm	—(pattern data)	£4,000–£6,500[PLACEHOLDER]

Technical SpecsB57D30T2

Displacement: 2,993 cc (3.0L)
Cylinders: 6-cylinder inline
Bore: 84 mm / Stroke: 90 mm
Compression Ratio: 16.5:1
Fuel System: Common-rail direct injection
Turbocharger: Twin-turbo (TwinPower Turbo)
Valvetrain: DOHC, 4 valves per cylinder (24 total)
Mild Hybrid: 48V starter-generator (11 hp / 25 Nm)
Engine Oil: 6.5–7.0 litres, 5W-30 / 0W-30 LL-04 spec
0-62 mph: 4.5–4.6 seconds
Top Speed: 155 mph (limited)
Fuel Economy: 47.1–47.9 mpg

Compare M440d engine prices for your BMWGet quotes from trusted UK specialists in minutes.

Market Intelligence

Real data from thousands of 4 Series M440d enquiries in 2025.

Most Common FailureEGR cooler coolant leaks

Subject to global BMW recalls affecting diesel engines

Average Enquiry Mileage

30,000–60,000

miles

[PATTERN DATA]

Average Replacement Cost

£5,000–£6,500

reconditioned, supply only

[PLACEHOLDER]

Most Requested Engine Code

B57D30T2

[PATTERN DATA]

Peak Enquiry Season

Winter

Cold starts and DPF issues become more apparent

[PATTERN DATA]

Regional Demand

London: 22%
South East: 18%
North West: 12%
Other Regions: 48%

[PATTERN DATA]

Regional Demand Breakdown

22%London18%South East12%North West48%Other Regions

Frequently Asked Questions

A reconditioned M440d (B57) engine typically costs £4,000–£6,500 supply only. Fitting adds £2,000–£3,500 depending on location and workshop rates. Main dealer new engines start from £14,000–£18,000+ supply only. Use our calculator for a figure specific to your car.

Yes — the B57 is widely regarded as one of BMW's most reliable modern diesel engines. It's described as "the golden mean between performance, consumption and longevity" and "probably one of the best engines BMW has ever produced". Unlike the N47 and early N57 engines, B57 timing chain issues are "exceedingly rare". However, EGR cooler coolant leaks (subject to BMW recalls), DPF clogging from short journeys, carbon buildup, and injector wear are well-documented issues.

The main known issues are: (1) EGR cooler coolant leaks — the most prevalent problem, subject to global BMW recalls, (2) DPF clogging — particularly on vehicles used for short urban journeys, (3) Carbon buildup in the intake system — from oil vapour and soot, and (4) Injector wear — causing rough idle and misfires.

Depends on vehicle value and condition. Against a well-kept £25,000–£40,000 M440d, a £5,000–£6,500 recon is 15–25% of the car's value — worth it given the M440d's strong retained values. For higher-mileage examples, evaluate the car's overall condition before committing. The B57's robust reliability means that with proper maintenance, these engines can achieve very high mileages.

The M440d uses the B57D30T2 engine (also known as B57D30B) — a 3.0-litre twin-turbo inline-six diesel. The engine code is stamped on the cylinder block. Tell us your registration and we'll confirm it for free.

Unlike the infamous N47 diesel, the B57's timing chain is notably robust and reliable. Timing chain stretch and guide failures are "exceedingly rare". The B57 timing chain is located at the rear of the engine but has been significantly improved over earlier BMW diesel engines. With proper maintenance and regular oil changes using the correct BMW LL-04 spec oil, timing chain issues are unlikely.

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 M440d Owners Trust BMWEngines.uk

Trusted M440d Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real M440d owners, across the B57D30T2 engine, as part of the Engine Finders network.
Compare M440d Engine Replacement Companies
see prices, warranty terms and supply & fit options side-by-side before you commit.
UK Engine Replacement Services for M440d
supply-only or full supply & fit available nationwide, covering every G22/G23/G26 M440d since 2020.

Find the best BMW M440d engine replacement UK drivers rely on.

Compare prices from trusted specialists on EnginesMarket today and get back on the road with confidence.

Compare BMW M440d Engine Prices Now

100% FreeNo hidden fees
No ObligationGet quotes with zero pressure
UK Specialists20+ vetted experts
12-Month WarrantyAs standard
Nationwide DeliverySupply & fit available

BMW M440d Engine Replacement —Compare Prices &Get Quotes

BMW M440d — Which Engine Does Your Car Actually Have?

BMW M440d Engine Replacement Costs

Common Problems With BMW 4 Series M440d Engines

1. EGR Cooler Coolant Leak

2. DPF Clogging(Urban Driving)

3. Carbon Build-Up in Intake System

4. Injector Wear

1. EGR Cooler Coolant Leak

2. DPF Clogging(Urban Driving)

3. Carbon Build-Up in Intake System

4. Injector Wear

Ready to Compare?

M440d — Repair, Buy, or Replace?

Can It Be Repaired?

Buying This M440d? Check These First

Buying Checklist

Buying Checklist

Engine Codes

Market Intelligence

Regional Demand Breakdown

Frequently Asked Questions

Why UK BMW M440d Owners Trust BMWEngines.uk

Trusted M440d Engine Suppliers

Compare M440d Engine Replacement Companies

UK Engine Replacement Services for M440d

BMW M440d Engine Replacement —Compare Prices &
Get Quotes