BMW 4 Series M440d Engine ReplacementCompare 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.
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
From £5,000 to £8,500
Used from £2,800 · Reconditioned from £5,000 · Common codes: B57D30T2, B57D30B
From £2,800
Tested, bare/short engine
From £5,000
Rod bearings addressed, tested
From quote
Upgraded bearings, full teardown, revised valvetrain
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3 Simple Steps3 Simple Stepsto Finding the Best BMW 4 Series M440d Replacement Engineto Finding the Best BMW 4 Series M440d Replacement Engine
Most replacements completed within 3-5 days.
Variant HistoryBMW 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.
Variant HistoryBMW 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.
BMW 4 Series M440d
Fuel TypeDiesel (Mild-Hybrid)
Engine Size3.0L (2993cc)
Power Output340hp (250kW) across all generationsEngine History Timeline
B57D30T2 3.0L straight-six twin-turbo diesel, 340hp, 700Nm, launch of G22 M440d xDrive Coupe with mild-hybrid technology
G23 M440d xDrive Convertible joins the range
G26 M440d xDrive Gran Coupe joins the range
G22 LCI facelift; engine code transitions to B57D30B with Euro 6e emissions compliance
present - Continued production with B57D30B 340hp, 700Nm, mild-hybrid
Key Specs Snapshot
Fuel TypeDiesel (Mild-Hybrid)Engine Size3.0L (2993cc)Power Output340hp (250kW) across all generationsTorque700NmYears Produced2021-presentEvery engine fitted to the BMW 4 Series M440d is covered below, with UK rebuilt pricing and known failure points.
BMW 4 Series M440d Engine Codes - Specifications & Replacement CostBMW 4 Series M440d Engine Codes - Specifications & Replacement Cost
3.0L Diesel Twin-Turbo Mild-Hybrid (2021-2024)
Power Output340hp (250kW) at 4,400rpmTorque700Nm at 1,750-2,250rpmYears Fitted2021-2024 (G22/G23/G26 pre-LCI)
Compatible Trim Levels
- M440d xDrive M Sport
- M440d xDrive M Sport Pro
Find your exact engine code, specs and UK replacement cost guide.
Used
Tested, ready-to-fit engine
£2,800-£5,000
Reconditioned
Addressed known issues, tested
£5,000-£8,000
Rebuilt
Full teardown, upgraded internals
£7,000-£10,500
Common Failure
The B57D30T2 is a twin-turbo unit and generally robust, but some owners report EGR cooler leaks - coolant can leak into the exhaust, potentially causing white smoke or overheating. DPF clogging in urban use and occasional turbocharger wastegate issues have also been noted on higher-mileage examples.
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.
Why the BMW M440d B57 Engine Needs Attention
Affected Vehicles
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.
Why It Happens
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.
Dealer (parts + labour)
£1,200-£2,000
Specialist (parts + labour)
£800-£1,500
What it involves
Replace EGR cooler, flush cooling system, inspect DPF
Suitability
First step - prevents coolant contamination of DPF
1 - 2 daysDealer (parts + labour)
£10,000-£15,000
Specialist (parts + labour)
£5,000-£10,500
What it involves
Supply & fit, upgraded components addressing the original failure point, 12-month warranty
Suitability
If EGR failure has caused engine damage
1 - 2 daysAll prices are indicative UK market ranges based on current UK specialist supplier data.| Repair Tier | Dealer (Parts + Labour) | Specialist (Parts + Labour) | What It Involves | Suitability | Estimated Time |
|---|---|---|---|---|---|
 EGR cooler replacement Minor | £1,200-£2,000 | £800-£1,500 | Replace EGR cooler, flush cooling system, inspect DPF | First step - prevents coolant contamination of DPF | 1 - 2 days |
 Full Replacement - rebuilt/reconditioned engine Best Value | £10,000-£15,000 | £5,000-£10,500 | Supply & fit, upgraded components addressing the original failure point, 12-month warranty | If EGR failure has caused engine damage | 1 - 2 days |
Vehicle Value Check
Vehicle Value Check
Apply this UK-wide decision framework to your BMW 4 Series M440d: - Vehicle worth under ~£5,000: repair or used engine typically makes more sense than a full rebuilt unit. - Vehicle worth ~£5,000-£8,000: evaluate both; reconditioned is viable if keeping the car 2+ years. - Vehicle worth ~£8,000-£15,000: reconditioned/rebuilt usually justifies the premium via warranty and reliability. - Vehicle worth £15,000+: replacement cost is typically small relative to vehicle value.
Our Recommendation
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.
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.
Compare rebuilt B57D30T2 BMW 4 Series M440d engine prices
12-Month Minimum
UK Specialists Vetted
Best Price GuidanceImportant Information
Important Information
"All prices are indicative UK market ranges based on historical quote data and repair requests from our network of engine specialists. Dealer pricing is estimated based on published main dealer labour rates and genuine OEM parts pricing. Specialist pricing reflects actual quote data from EnginesMarket's UK network. Actual costs vary depending on damage severity, vehicle condition, variant, and workshop location within the UK. Use our free comparison tool to get tailored quotes for your specific BMW 4 Series M440d. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier."
BMW 4 Series M440d Engine ReplacementFrequently Asked Questions
Question 1How much does a BMW 4 Series M440d engine replacement cost in the UK-
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
Question 2Is the BMW M440d engine reliable-
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
Question 3Is it worth replacing the engine in a BMW 4 Series M440d-
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
Question 4What's the difference between the BMW M440d and 430d engines-
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
Question 5How 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
Question 6How 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
Why Choose UsCompare BMW 4 Series M440dEngine PricesToday
400+ M440d engines supplied through our network
12-Month Warranty on every rebuilt M440d engine
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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.
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