How long does a BMW 4 Series M440d engine replacement take-

A typical BMW M440d engine replacement takes 16-22 hours of workshop labour due to the complex twin-turbo straight-six layout and xDrive system. With parts sourcing and scheduling, allow 4-8 working days from order to completion. Supply-only: 2-5 working days for delivery. Supply & fit: 5-8 working days total.

How do I know if my BMW M440d has the B57D30T2 or B57D30B engine-

The engine code transition happened with the LCI facelift in 2024. Pre-LCI models (2021-2024) have the B57D30T2, while LCI models (2024 onwards) have the B57D30B. The easiest way to check is by decoding your VIN. Pre-2024 models (G22/G23/G26) have B57D30T2. 2024-onwards LCI models have B57D30B.

BMW M440d SPECIALISTS

BMW 4 Series M440d Engine Replacement Compare Prices & Get Quotes

Get instant quotes today from trusted UK BMW 4 Series M440d engine specialists. Compare prices on reconditioned, rebuilt and used engines for your M440d xDrive - whether you drive a Coupe, Convertible or Gran Coupe.

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BMW 4 Series M440d Engine

from£5,000 to £8,500

Usedfrom £2,800
Reconditionedfrom £5,000
Common codesB57D30T2, B57D30B

BMW 4-series M440d Used Engine — B57D30T2

BMW 4-seriesUsed Engine — B57D30T2

BMW 4-series M440d Reconditioned Engine — B57D30T2

BMW 4-seriesReconditioned Engine — B57D30T2

BMW 4-series M440d Rebuilt Engine — B57D30T2

BMW 4-seriesRebuilt Engine — B57D30T2

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How it works

3 Simple Steps to Finding the Right Replacement Engine

Clear information first, then the right engine and specialist for your exact vehicle.

Variant History

BMW 4 Series M440d Engine History & Specs at a Glance

The BMW M440d xDrive was introduced in 2021 as the flagship diesel performance model in the G22 4 Series range, sitting above the 430d with a more powerful twin-turbo version of the B57 straight-six. The M440d delivers 340hp and 700Nm of torque, matching the M440i's 0-62mph time of 4.6 seconds while offering superior fuel economy - a genuine M Performance diesel for the UK market.

2021
B57D30T2, 3.0L straight-six twin-turbo diesel, 340hp, 700Nm, launch of G22 M440d xDrive Coupe with mild-hybrid technology
2021
G23 M440d xDrive Convertible joins the range
2022
G26 M440d xDrive Gran Coupe joins the range
2024
G22 LCI facelift; engine code transitions to B57D30B with Euro 6e emissions compliance
2024
present - Continued production with B57D30B, 340hp, 700Nm, mild-hybrid

Every engine fitted to the BMW 4 Series M440d is covered below, with UK rebuilt pricing and known failure points.

Compatible Engines

BMW 4 Series M440d Engine Codes Specifications & Replacement Cost

Find your exact engine code, specs and UK replacement cost guide.

B57D30T2 — 3.0L Diesel Twin-Turbo Mild-Hybrid (2021-2024)

Power Output: 340hp (250kW) at 4,400rpm
Torque: 700Nm at 1,750-2,250rpm
Years Fitted: 2021-2024 (G22/G23/G26 pre-LCI)

Can’t find your exact engine code?-> Get quotes for B57D30T2 BMW 4 Series M440d engine replacement

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Common Problems

BMW 4 Series M440d Engine Problems Repair Cost vs Replacement

The BMW M440d is powered by the B57 twin-turbo straight-six - one of BMW's most advanced diesel engines, delivering M Performance levels of power with surprising efficiency. While generally robust, the B57 has known weaknesses including EGR cooler failures, DPF clogging in urban use, and occasional turbocharger issues. For M440d owners facing major engine failure, rebuilt engines through EnginesMarket include upgraded components addressing the original failure point, plus a minimum 12-month unlimited-mileage warranty.

Common failure points and repair options

EGR Cooler Failure

Affected: BMW 4 Series M440d (B57D30T2 / B57D30B, 2021-present)
Typical failure mileage: 60,000-120,000 miles

Root cause

The EGR cooler can develop internal leaks, allowing coolant to enter the exhaust system. This can cause white smoke from the exhaust, coolant loss, and in severe cases, engine overheating or fire risk - BMW has issued recalls on some B57 vehicles for this issue.

Repair options

Repair tier	Dealer price	Specialist price
EGR cooler replacement	£1,200-£2,000	£800-£1,500
Full Replacement - rebuilt/reconditioned engine	£10,000-£15,000	£5,000-£10,500

Our recommendation

If you notice white smoke from the exhaust or coolant levels dropping in your M440d, have the EGR cooler inspected immediately. An £800-£1,500 EGR cooler replacement is far cheaper than a £5,000+ engine replacement if the issue escalates.

-> Compare rebuilt B57D30T2 BMW 4 Series M440d engine prices

DPF & Turbocharger Issues

Affected: BMW 4 Series M440d (B57D30T2 / B57D30B, 2021-present)
Typical failure mileage: 80,000-150,000 miles (DPF); 60,000-120,000 miles (turbo)

Root cause

The DPF can become clogged with soot if the M440d is used predominantly for short urban journeys without regular motorway driving. Turbocharger issues - wastegate wear, oil supply problems - are less common but have been reported on higher-mileage B57 units.

Repair options

Repair tier	Dealer price	Specialist price
DPF forced regeneration / cleaning	£400-£800	£250-£500
DPF replacement	£1,500-£3,000	£1,000-£2,000
Turbocharger replacement	£3,000-£5,000	£1,800-£3,000
Full engine rebuild/replacement	£10,000-£15,000	£5,000-£10,500

Our recommendation

For M440d owners, ensure regular motorway driving to allow DPF regeneration - if the warning light appears, a forced regeneration (£250-£500) is far cheaper than a new DPF. For turbo health, allow the engine to idle for 30-60 seconds after hard driving to cool the turbocharger.

-> Compare rebuilt B57D30B BMW 4 Series M440d engine prices

Don't Let Engine Failure Write Off Your BMW 4 Series M440d

Every BMW M440d engine supplied through EnginesMarket carries a minimum 12-month unlimited-mileage warranty - whether you choose a used, reconditioned or rebuilt unit. Our network of vetted UK specialists offers nationwide delivery and supply & fit options, often at 40-60% below main dealer pricing. Don't scrap your M440d over a failed engine - compare specialist quotes today.

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FAQ

BMW 4 Series M440d Engine ReplacementFrequently Asked Questions

Everything BMW 4 Series M440d owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

A full BMW M440d engine replacement typically costs between £2,800 and £10,500 for the engine itself, depending on whether you choose used, reconditioned or rebuilt. Specialist fitting adds £1,040-£1,430 in labour due to the complex twin-turbo straight-six layout.

Used B57D30T2: £2,800-£5,000
Reconditioned B57D30T2: £5,000-£8,000
Rebuilt B57D30T2: £7,000-£10,500

-> Get a tailored BMW M440d engine quote now

The B57 engine in the M440d is generally considered robust and reliable, especially compared to earlier BMW diesel engines like the N47 and N57. However, EGR cooler leaks (coolant into exhaust) are a known issue, and DPF clogging can occur with predominantly urban use.

EGR cooler replacement costs £800-£1,500 at a specialist
Regular motorway driving helps prevent DPF issues
The B57 is significantly more reliable than the N57 it replaced

-> Check your BMW M440d engine code now

For an M440d worth £25,000-£40,000, a reconditioned or rebuilt engine (£5,000-£10,500) is a sound investment that can extend the car's life by 100,000+ miles. Given the high value of the M440d, replacement is almost always justified over scrapping.

Always factor in fitting costs (£1,040-£1,430)
Every engine through EnginesMarket comes with a 12-month warranty

-> Compare BMW M440d engine options

Both are 3.0-litre straight-six diesels, but the M440d uses a twin-turbo setup producing 340hp and 700Nm torque, while the 430d produces 286hp from a single (or twin-turbo depending on generation) setup. The M440d also features M Performance styling and chassis upgrades.

M440d: 340hp, 700Nm, 0-62mph in 4.6 seconds
430d: 286hp, 0-62mph in 5.1 seconds
M440d commands a significant price premium

-> Compare BMW 4 Series diesel options

Why Choose Us

Compare BMW 4 Series M440d Engine Prices Today

Comparing quotes for your BMW 4 Series M440d engine replacement is free, no-obligation, and specific to your exact engine code - whether you need a used B57D30T2, a reconditioned B57D30B, or a fully rebuilt unit with warranty. Our network of vetted UK specialists offers transparent pricing, nationwide delivery, and supply & fit options to get your M440d back on the road with minimum hassle.

400+400+ M440d engines supplied through our network

12-Month12-Month Warranty on every rebuilt M440d engine

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Compare quotes from trusted UK BMW 4 Series M440d engine specialists with warranty-backed rebuilt, reconditioned and used options nationwide.