How much does a BMW M440d engine replacement cost in the UK?

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.

Is the BMW M440d engine reliable?

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.

What are the common problems with the BMW M440d?

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.

Is it worth replacing a BMW M440d engine, or should I scrap the car?

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.

How do I find my BMW M440d engine code?

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.

Does the B57 have timing chain issues?

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.

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.

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12-Month Warranty

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Supply & Fit Available

12-Month Warranty

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

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

Instant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide Network

BMW M440d - Which Engine Does Your Car Actually Have?

Four generations. Four eras. 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

GenerationYearsEngine CodeReliabilityRecon CostEra Note

G22/G23/G26 BMW 320d G22/G23/G26

2020–presentB57D30T2 (B57D30B)★★★★☆ [NEWLY ASSIGNED - see Data Note]£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 UK Cost Data

Verified Reliability

Expert Insights

Updated for 2025

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 TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£2,000–£4,500£3,000–£6,0001–6 monthsBudget priority; lower-mileage donor

Reconditioned Engine£4,000–£6,500£6,000–£8,50012–24 monthsMost owners - best cost/warranty balance

Rebuilt Engine£5,000–£8,500£7,000–£10,50012–24 monthsLong-term ownership; 3+ year horizon

Main Dealer New£14,000–£18,000+£16,000–£20,000+24–36 monthsInsurance 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 320d 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)

🟠 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

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)

🟠 Check - verify recall completion status immediately; coolant loss can cause serious engine damage

Our recommendation:

Read the full EGR cooler failure guide

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)

🟡 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

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

🟡 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]

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)

🟡 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

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M440d - 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.

M440d - 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 SenseEGR cooler coolant leak✅ Yes£0 (recall) / £600–£1,200Free under recall; straightforward replacement out of warrantyDPF clogging✅ Yes£300–£800Forced regeneration or motorway run; replacement if severeCarbon buildup (intake)✅ Yes£300–£800Walnut blasting - restores performanceInjector wear✅ Yes£400–£800 eachCatch early to prevent engine damageTiming chain failure❌ Usually NoEngine replacementRare 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.Get the right engine at the right price.

→ Compare M440d engine prices before you buy

Don't Guess. Compare.

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Buying Checklist

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

EGR Recall

Verify EGR cooler recall completion - this is critical and affects BMW diesel engines globally

Cold Start

Listen for any unusual rattling or knocking (B57 timing chain is generally robust, but listen anyway)

DPF Health

Check for DPF warning lights; short journeys are a red flag

Service History

Including the B57 engine and confirmed BMW-approved oil changes (5W-30 / 0W-30 LL-04)

Coolant Level

Check for frequent top-ups; inspect for EGR cooler leaks

Injector Health

Any rough idle, misfires, or black smoke?

Engine Warning Light

Have codes been read? Look for EGR, DPF, or injector-related codes

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.

B57D30T2 (B57D30B)

Years2020–present

Power340 bhp (250 kW) / 700 Nm

2025 Enquiries- (pattern data)

Avg. Recon Cost£4,000–£6,500【PLACEHOLDER】

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

B57D30T2 (B57D30B)2020–present340 bhp (250 kW) / 700 Nm- (pattern data)£4,000–£6,500【PLACEHOLDER】

Technical Specs

B57D30T2

Displacement2,993 cc (3.0L)

Cylinders6-cylinder inline

Bore84 mm / Stroke: 90 mm

Compression Ratio16.5:1

Fuel SystemCommon-rail direct injection

TurbochargerTwin-turbo (TwinPower Turbo)

ValvetrainDOHC, 4 valves per cylinder (24 total)

Mild Hybrid48V starter-generator (11 hp / 25 Nm)

Engine Oil6.5–7.0 litres, 5W-30 / 0W-30 LL-04 spec

0-62 mph4.5–4.6 seconds

Top Speed155 mph (limited)

Fuel Economy47.1–47.9 mpg

→ Compare M440d engine prices for your BMW

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Market Intelligence

Most Common Failure

EGR 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

London22%

South East18%

North West (12%)【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.

Why UK BMW M440d Owners Trust BMWEngines.uk

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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.
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12-Month Warranty

As standard

Nationwide Delivery

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