Engines Market

BMW X3 M40d SPECIALISTS

BMW X3 M40d Engine Replacement Compare Prices & Get Quotes

Get quotes today from trusted UK BMW X3 M40d engine specialists. Compare prices on reconditioned, rebuilt and used BMW X3 M40d engines - supply & fit available nationwide for the ultimate performance diesel SUV.

Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
BMW X3 M40d Engine
from£4,200 to £7,500
  • Usedfrom £2,500
  • Reconditionedfrom £4,500
  • Common codesB57D30B, B57D30A
BMW x3 M40d Used Engine — B57D30BBMW x3Used Engine — B57D30BBMW x3 M40d Reconditioned Engine — B57D30BBMW x3Reconditioned Engine — B57D30BBMW x3 M40d Rebuilt Engine — B57D30BBMW x3Rebuilt Engine — B57D30B

Get your free BMW x3 M40d engine quotes

Secure enquiry — no spam, no pressure. Genuine quotes only from vetted UK specialists.

Instant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide NetworkInstant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide NetworkInstant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide NetworkInstant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide Network

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 X3 M40d Engine History & Specs at a Glance

The BMW X3 M40d arrived with the G01 generation in 2018 as the flagship diesel performance variant, sitting above the xDrive30d and below the X3 M. Powered by the B57D30B 3.0-litre straight-six diesel with twin-turbocharging, the M40d delivers 340hp and a monumental 700Nm of torque - making it one of the most powerful production diesel SUVs ever sold in the UK. With M Performance treatment including enhanced cooling, a sports exhaust and adaptive suspension, the M40d offers the effortless torque of a diesel with the performance credentials to match.

BMW X3 M40d
  1. 2018

    G01 X3 M40d launches with B57D30B, 326hp (UK market), 680Nm, twin-turbo straight-six diesel

  2. 2019

    B57D30B updated to 340hp, 700Nm with revised ECU calibration and improved emissions hardware

  3. 2020

    48V mild hybrid system introduced, improving stop-start smoothness and reducing turbo lag

  4. 2021

    G01 LCI facelift brings revised styling, iDrive 7 and continued B57D30B with MHEV

  5. 2023

    M40d continues through to end of G01 production

  6. 2024

    G45 generation launches; M40d badge replaced by M50 diesel in some markets

Every engine fitted to the BMW X3 M40d is covered below, with UK rebuilt pricing and known failure points.

Engine Codes & Pricing

BMW X3 M40d Engine Codes Specifications & Replacement Cost

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

B57D30B — 3.0L Twin-Turbo Diesel (2018-2024) engine

B57D30B — 3.0L Twin-Turbo Diesel (2018-2024)

Power Output
326-340hp (depending on model year)
Torque
680-700Nm
Years Fitted
2018-2024 (G01)
Engine Code
B57D30B
Note
The M40d's B57 engine is shared with the M550d and M850d in different states of tune - but X3 M40d units have specific ECU calibration and cooling requirements

Can’t find your exact engine code?-> Get quotes for B57D30B BMW X3 M40d engine replacement

-> Get quotes for B57D30B BMW X3 M40d engine replacement

Common Problems

BMW X3 M40d Engine Problems Repair Cost vs Replacement

The BMW X3 M40d's B57D30B twin-turbo diesel is a masterpiece of engineering - but even the best engines have their weak points. While the B57 is significantly more reliable than the older N57, issues with the AdBlue system, DPF, EGR cooler, and high-pressure fuel pump have been reported. Every rebuilt engine supplied through Engines Market includes upgraded components addressing the original failure point - plus a minimum 12-month unlimited-mileage warranty. Below we break down the most common X3 M40d failures, what genuine repair costs look like, and when a rebuilt engine is the smarter financial decision.

Common failure points and repair options

BMW X3 M40d AdBlue / SCR System Failure

Affected
BMW X3 M40d (2018-2024, B57D30B)
Typical failure mileage
40,000-80,000 miles
Root cause
The AdBlue (DEF) injection system can suffer from crystallisation and clogging of the injector nozzle. NOx sensors can also fail, triggering warning lights and potentially limiting vehicle performance. The dosing line from the tank to the injector can become blocked or damaged.

Repair options

Repair tierDealer priceSpecialist price
Minor - AdBlue Injector Cleaning / Replacement£400-£700£200-£400
Intermediate - AdBlue Dosing System Overhaul£800-£1,500£500-£900
Full Replacement - Rebuilt Engine (Supply & Fit)£6,000-£9,000£4,500-£6,500
Our recommendation
If you see an AdBlue system warning or the dreaded "Engine start in X miles" countdown, do not ignore it. Have a specialist diagnose the system immediately - a £200-£400 injector cleaning is far cheaper than a £4,500+ engine replacement. Use only genuine AdBlue fluid and avoid supermarket own-brand products.
-> Get quotes for BMW X3 M40d AdBlue system repair and engine replacement

BMW X3 M40d EGR Cooler Failure

Affected
BMW X3 M40d (2018-2024, B57D30B)
Typical failure mileage
50,000-90,000 miles
Root cause
The EGR cooler can develop internal cracks due to thermal cycling, allowing coolant to leak into the exhaust system. In severe cases, coolant can enter the combustion chambers, causing hydraulic lock (hydrolock) and bent connecting rods. Symptoms include coolant loss, sweet-smelling white exhaust smoke, and rough running.

Repair options

Repair tierDealer priceSpecialist price
Minor - EGR Cooler Replacement Only£1,000-£1,500£550-£850
Major - Cooler + Top End Overhaul£2,800-£4,000£1,800-£2,800
Full Replacement - Rebuilt Engine (Supply & Fit)£6,000-£9,000£4,500-£6,500
Our recommendation
Check if your X3 M40d has outstanding EGR cooler recall work. If you notice coolant loss, white exhaust smoke, or a burning smell, have a specialist inspect the EGR cooler immediately. A £550-£850 cooler replacement is cheap insurance against a £4,500+ engine rebuild.
-> Get quotes for BMW X3 M40d EGR cooler repair and replacement

BMW X3 M40d DPF & Turbocharger Issues

Affected
BMW X3 M40d (2018-2024, B57D30B)
Typical failure mileage
60,000-100,000 miles (DPF); 80,000-120,000 miles (turbo)
Root cause
Urban driving cycles prevent active DPF regeneration, causing soot accumulation. The turbocharger in the M40d is critical for its high-performance output but is prone to wear and tear over time, leading to oil leaks, worn bearings, or damage to the turbine blades.

Repair options

Repair tierDealer priceSpecialist price
Minor - DPF Clean & EGR Service£600-£900£350-£600
Intermediate - Turbocharger Replacement£2,200-£3,500£1,300-£2,200
Full Replacement - Rebuilt Engine with New Turbo (Supply & Fit)£6,500-£9,500£4,800-£6,800
Our recommendation
If you only drive short urban trips, take your X3 M40d on a 30-minute motorway run every few weeks to allow DPF regeneration. If you hear a whining noise or experience loss of power, stop driving and have a specialist inspect the turbo immediately. A £1,300-£2,200 turbo replacement is far cheaper than a £4,800+ engine rebuild.
-> Compare BMW X3 M40d DPF and turbo replacement costs

BMW X3 M40d High-Pressure Fuel Pump (HPFP) Failure

Affected
BMW X3 M40d (2018-2024, B57D30B)
Typical failure mileage
60,000-100,000 miles
Root cause
The high-pressure fuel pump in the B57D30B can develop internal wear, leading to poor starting, reduced performance, and fuel system contamination. Fuel injector issues can also cause rough idling, decreased fuel efficiency, and engine misfires.

Repair options

Repair tierDealer priceSpecialist price
Minor - HPFP Replacement Only£1,200-£1,800£700-£1,200
Intermediate - HPFP + Full Injector Set£2,800-£4,000£1,800-£2,800
Full Replacement - Rebuilt Engine (Supply & Fit)£6,000-£9,000£4,500-£6,500
Our recommendation
If your X3 M40d struggles to start, runs rough, or has poor fuel economy, have the HPFP and injectors tested immediately. A £700-£1,200 HPFP replacement is far cheaper than a £4,500+ engine rebuild. Use only premium diesel fuel to help protect the high-pressure fuel system.
-> Get quotes for BMW X3 M40d HPFP and injector repair

Don't Let Engine Failure Write Off Your BMW X3 M40d

The failures above account for the majority of BMW X3 M40d engine replacement enquiries we see - AdBlue system issues, EGR cooler failure, DPF and turbocharger problems, and HPFP wear. The B57 is a robust engine, but it demands proper maintenance and prompt attention to warning signs. Engines Market makes it simple to compare prices from trusted UK BMW X3 M40d specialists who use upgraded components specifically designed to prevent these failures from recurring. Every rebuilt engine includes a minimum 12-month unlimited-mileage warranty, nationwide delivery, and supply & fit options. Compare prices today and get back on the road without the main dealer premium.

Compare BMW X3 M40d Engine Replacement Prices Now ->

FAQ

BMW X3 M40d Engine ReplacementFrequently Asked Questions

Everything BMW X3 M40d owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

Why Choose Us

Compare BMW X3 M40d Engine Prices Today

Comparing quotes for your BMW X3 M40d is free, fast, and completely no-obligation. Enter your registration above to receive tailored prices from UK BMW M Performance specialists for your exact engine code - whether you need a used B57D30B, a reconditioned unit, or a fully rebuilt engine with warranty. Our network covers all G01 M40d variants, with supply & fit available nationwide. Get back on the road with confidence and without the main dealer premium.

100+100+ BMW M Performance engines supplied through our network
12-Month12-Month Warranty on every rebuilt BMW X3 M40d engine
NationwideNationwide UK delivery
Get Free BMW X3 M40d Engine Quotes ->

Compare quotes from trusted UK BMW X3 M40d engine specialists with warranty-backed rebuilt, reconditioned and used options nationwide.