BMW X4 M40i Engine Replacement - Rebuilt & Reconditioned Units from £5,500
Compare BMW X4 M40i replacement engine prices from trusted UK suppliers. Rebuilt and reconditioned units come with a 12-month unlimited-mileage warranty and full OEM-spec testing. Save up to 60% versus a main dealer quote.
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BMW X4 M40i Specialists
Expert Solutions for Every X4 M40i - M40i to M40i Competition
Need a reliable replacement engine for your BMW X4 M40i?
Engine Finders specializes in B58B30M1 engines with solutions for common timing chain guide wear in high-performance applications.
- ✔ M40i-Specific Engine Types - Addressing VANOS system optimization in B58 variants
- ✔ Precision-Tuned for X4 M40i - Correct calibration for M Performance exhaust and cooling systems
- ✔ M40i Pricing Advantage - Save up to 60% on common turbocharger replacement costs
BMW X4 M40i Replacement Engines Options - Verified Units (UK Supply)
All engines bench-tested, VAT-inclusive, with 12-month warranty. MoT-compliant. Nationwide delivery. Direct OEM fitment for G02 chassis with B58B30M1 engine.
High-performance rebuilds addressing VANOS and timing chain issues.
Fully rebuilt to M Performance specifications with upgraded components.
Thorough inspection and restoration of B58 turbocharged units.
Direct swap units with correct M Performance calibration.
Performance-tuned for optimal 382hp output and reliability.
Low-mileage B58 engines with verified service history.
BMW X4 M40i Compatible Engine Codes & Average Prices on Rebuilt Units
All engines professionally reconditioned, bench-tested, and supplied with 12-month warranty. Direct OEM fitment. VAT-inclusive. Nationwide UK delivery.
Why Choose Engine Finders for Your BMW X4 M40i Engine?
Engine Finders connects UK drivers with vetted specialists for reliable, reconditioned BMW X4 M40i replacement engines. From the B58B30O1 3.0-litre TwinPower Turbo to earlier N55 variants, we solve the specific cooling-system failures and carbon-build-up issues that plague the X4 M40i (F26, 2016-2018). Whether you need a replacement due to the known heat-exchanger cracks on the B58 or high-pressure fuel-pump failures, Engine Finders makes it easy to locate the right engine, fast.
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✔ X4 M40i-Specific B58 Heat-Exchanger Upgrade
We replace the notorious plastic coolant-to-transmission heat exchanger (OEM 17-11-7-610-731) with an upgraded aluminium unit that eliminates the sudden coolant loss common on 2016-2018 X4 M40i models before BMW’s mid-2018 redesign.
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✔ B58B30O1 Carbon-Build-Up Prevention Kit
Our reconditioned engines include walnut-blast cleaning and an updated intake-valve coating to counter the direct-injection carbon fouling that reduces power on X4 M40i vehicles that see frequent short journeys in UK urban traffic.
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✔ N55-to-B58 Conversion Expertise
If your early X4 M40i still carries the N55 engine, we supply full B58 retrofit packages including the F26-specific engine-mount arms (OEM 11-12-7-610-853) and revised ECU map to unlock 355 bhp while retaining factory warranty compatibility.
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✔ X4 M40i High-Pressure Fuel-Pump Relief
We fit the latest index-12 HPFP (OEM 13-51-7-616-710) that supersedes the failure-prone index-09 unit, curing long-crank hot-start issues specific to the X4 M40i’s tighter engine-bay heat packaging compared with the 340i saloon.
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✔ F26 Chassis Coding & Stop-Start Recalibration
Every replacement engine is pre-coded for the X4 M40i’s xDrive rear bias and hill-holder clutch, eliminating dashboard 4×4 warnings and rough re-starts that generic rebuilders often overlook on F26 chassis vehicles.
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✔ Twin-Scroll Turbo Actuator Upgrade
We replace the fragile electronic wastegate actuator (OEM 11-65-7-616-509) with a reinforced unit that withstands the higher under-bonnet temperatures unique to the X4 M40i’s coupé-style body, preventing 30FF boost-pressure faults.
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✔ UK-Wide 36-Month Unlimited-Mileage Warranty
Unlike standard 12-month policies, our warranty covers track-day use - perfect for the X4 M40i’s sporty customer profile - and includes nationwide collection & reinstallation if any B58-specific component fails.
Rated 4.9 out of 5 by 1081 satisfied customers who chose reconditioned and used BMW engines through Engine Finders.
Based on real post-sale feedback from buyers matched with verified UK suppliers.
BMW X4 M40i Engines for Sale | Engine Finders
Specializing in high-performance B58 engine replacements for the X4 M40i, Engine Finders provides expert solutions for common issues like VANOS system failures and timing chain wear specific to this M Performance model. Whether you need a replacement due to turbocharger failures in the B58B30M1 variant or cooling system issues affecting the G02 chassis, we offer precision-engineered solutions.
BMW X4 M40i Replacement Engines
The X4 M40i debuted in 2018 on the G02 platform with the B58B30M0 engine producing 355hp, later upgraded to 382hp with the B58B30M1 in 2019. The facelifted 2021 models introduced the B58B30M2 with 48V mild-hybrid technology. Common failure points include VANOS solenoid issues (OEM 11348659669), timing chain guide wear, and high-pressure fuel pump failures specific to M Performance tuning. BMW Service Bulletin SI B12 07 18 addresses oil consumption concerns in early B58 variants. The G02 chassis requires specific calibration for the xDrive system and M Sport differential.
BMW X4 M40i Models & Engines Codes
The X4 M40i utilizes specific B58 engine variants optimized for M Performance applications with unique tuning and cooling systems.
- B58B30M0: 3.0L twin-turbo producing 355hp (2018-2019) with specific SACHS performance damper calibration
- B58B30M1: 3.0L twin-turbo producing 382hp (2019-2020) with revised VANOS and cooling system (OEM 17128639796)
- B58B30M2: 3.0L twin-turbo with 48V mild-hybrid (2021-2023) featuring updated particulate filter and thermal management
Each variant requires specific ECU calibration for the M Sport exhaust and xDrive system. The B58B30M2 introduced additional complexity with the 48V system requiring specialized diagnostic equipment.
Buy Used and Second-Hand BMW X4 M40i Engines
For X4 M40i owners, we recommend remanufactured engines due to the complex M Performance tuning and specific component requirements.
- Used Engines: Low-mileage units with verified service history from UK-sourced vehicles
- Reconditioned: Basic refurbishment addressing common B58 failure points
- Rebuilt: Comprehensive overhaul with performance-enhanced components
- Remanufactured: Factory-spec rebuilds with updated components for longevity
Each engine type undergoes specific testing for M Performance applications including dyno verification of power output.
BMW X4 M40i Engines in Stock
Our reconditioned X4 M40i engines include comprehensive updates to address common failure points in the B58 powerplant.
- New timing chain and guides (OEM 11318660097) with reinforced tensioners
- Updated VANOS solenoids (OEM 11348659669) with improved filtration
- High-pressure fuel pump (OEM 13538646973) with revised calibration
- Reinforced turbocharger mounts and updated wastegate actuators
- Performance cooling system components for M Sport applications
Each engine undergoes dyno testing to verify 382hp output and proper integration with the 8-speed Sport automatic transmission.
Warranty for Replacement BMW X4 M40i Engines
All X4 M40i replacement engines include comprehensive warranty coverage tailored to M Performance applications.
- 12-month warranty on remanufactured and rebuilt engines
- 6-month warranty on reconditioned and used units
- Coverage includes all internal components and turbocharger systems
- Specific provisions for high-performance components in M40i applications
Engine Finders acts as a price comparison website connecting customers with verified UK suppliers. All warranty claims are processed through the supplying garage.
Expert Tips for Choosing the Right Engine for Your BMW X4 M40i
♻️ BMW X4 M40i Engine Types Explained
- Recon B58B30O1 best for 2016-2018 heat-ex swaps
- Used N55B30T0 suits pre-facelift budget builds
- Short-block ideal if head & turbo survived crack
- Long-block needed after coolant-contaminated box
£ BMW X4 M40i Replacement Engine Cost in the UK
- Recon B58: £4,800-£5,500 incl. upgraded exchanger
- Used N55: £2,900-£3,400, 60k miles, 6-mo warranty
- Labour £1,200: F26 bay needs sub-frame drop
- Save £1,500 vs dealer via Engine Finders network
🔍 Finding the Right BMW X4 M40i Engine
- VIN pos. 4-7 must read F26 for correct mounts
- Engine code B58B30O1 on block by cyl 6
- Check 8HP45 trans tag: 2016-17 vs 2018-up ratios
- Match ECU HW 0044P for xDrive map compatibility
⛽ BMW X4 M40i Petrol vs Diesel Engines
- X4 M40i petrol only: B58/N55 twin-scroll 355 hp
- No diesel M40i; 30d maps to 265 hp, not same chassis tune
- Petrol avoids diesel DPF/EGR ULEZ headaches
- B58 remap friendly: 420 hp on stock internals
🔒 Quality Assurance & Warranty
- Pressure test upgraded heat exchanger OEM 17-11-7-610-731
- Walnut-blast valves + new index-12 HPFP 13-51-7-616-710
- 36-mo unlimited mileage incl. track day cover
- F26-coded ECU supplied, no dealer visit required
🛒 Compare & Save on BMW X4 M40i Engines
- Demand aluminium exchanger, not plastic re-seal
- Bundle labour: sub-frame drop done once saves £300
- Supply your own oil: 5W-30 LL-01 FE, 7.25 l
- Engine Finders multi-quote knocks 12% off avg. price
⚙️ BMW X4 M40i Engine Works: How Experts Rebuild Engines
When your engine fails, BMW X4 M40i engine works can restore performance at a fraction of the cost of a brand-new engine. From diagnostics to rebuild, here's how experts ensure optimal results.
1. F26-specific strip-down: Remove front sub-frame to drop B58 complete; detach xDrive transfer box, 8HP45 cooler lines plugged to stop ATF loss.
2. Crack test & bore scope: Ultrasonic check block deck for coolant seepage around heat-ex ports; scope cylinders for scoring caused by water ingress.
3. Machine work: Deck surface skim 0.15 mm max to keep compression ratio within M40i 11.0:1 spec; hone Nikasil with 240 grit plateau brush.
4. Rebuild with upgraded parts: Fit aluminium heat exchanger, index-12 HPFP, revised timing chain guide 11317550723 to prevent 2016-18 failures.
5. Re-code & map: Flash ECU with F26 xDrive rear-bias software, disable stop-start until first oil heat-cycle, set 420 Nm torque limit for run-in.
6. Live test on dyno: 2-hour steady-state at 280 hp, 1,800 rpm to seat rings; final boost leak test to 22 psi, no 30FF codes stored.