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Shop Used Bmw X4 Engines
The BMW X4 occupies a precise position in the BMW lineup the sports activity coupe built on the X3 platform but with a fastback roofline that prioritises driving character over maximum practicality. It has never been the obvious choice. Buyers who choose the bmw x4 over the X3 are specifically choosing the way it drives and the way it looks. When a Bmw X4 Engine fails, that same buyer is not interested in a generic replacement. They want the right engine, correctly sourced, with documentation behind it. That is the standard Turbo Auto Parts applies to every used BMW X4 engine we stock.
One Correction Worth Making X4 Has No V6
Searches for bmw x4 v6 appear regularly and the answer is straightforward. BMW has not produced a V6 engine for road use in decades. Every X4 engine option across both generations uses either a turbocharged inline-4 or a turbocharged inline-6. The distinction matters because BMW's inline-6 architecture with the engine's primary and secondary balance shafts produces a completely different character from a V6 of comparable displacement. When X4 owners describe wanting the "V6" they almost always mean the inline-6 powered variants. Our team identifies your exact engine code from the last seven digits of your VIN before confirming any order.
First Generation F26 - 2015 to 2018
The F26 X4 launched in 2015 with two engine options for the US market the N20B20 2.0L turbocharged inline-4 in the xDrive28i and the N55B30 3.0L turbocharged inline-6 in the xDrive35i and M40i configurations.
The N20B20 is the engine most F26 X4s were sold with in the United States. It produces 240 horsepower and delivers the efficient daily performance that suited the X4's positioning as a premium daily driver. The N20 has two documented failure points our team checks on every unit before dispatch timing chain tensioner wear and VANOS solenoid condition. The N20's single-rail timing chain system develops stretch on units where oil service intervals were extended, and VANOS actuator wear produces variable cam timing faults that register as cold-start hesitation before escalating into check engine codes. Both are checked on every F26 N20 unit without exception.
The N55B30 3.0L inline-6 in the xDrive35i and the S55-based M40i variant is the x4 engine that most enthusiast buyers want back in their vehicle after a failure. The N55 produces 300 horsepower in standard X4 specification and delivers a driving experience the four-cylinder cannot replicate. High-pressure fuel pump condition and charge pipe integrity are the two additional checks our team runs on N55 units beyond the standard compression and leakage assessment. HPFP failure on N55 engines is well-documented and a unit that does not pass fuel pressure testing does not enter our inventory.
Second Generation G02 - 2019 Onwards
The G02 X4 launched in 2019 brought BMW's modular engine family to the X4 lineup the B48B20 2.0L inline-4 replacing the N20 and the B58B30 3.0L inline-6 replacing the N55. Both are significant engineering improvements over the engines they replaced.
The B48 addresses the N20's timing chain sensitivity with a revised chain guide system and improved tensioner hydraulics. Oil consumption on the B48 is lower and VANOS response is more precise. Our team checks chain guide condition and VANOS actuator integrity on every B48 before dispatch the same check points as the N20 but with different pass thresholds reflecting the B48's improved baseline condition.
The B58 is one of the finest inline-6 engines BMW has produced in the modern era. It powers the bmw x4 xDrive40i and M40i variants and produces between 335 and 382 horsepower depending on specification. The B58's known inspection requirements focus on high-pressure fuel injector condition and charge cooling system integrity direct injection carbon buildup on intake valves is a usage-pattern issue on B58 units with predominantly short-trip service histories. Our team assesses intake valve condition on every B58 before it enters inventory and flags any unit showing significant buildup.
The G02 M40i specifically deserves mention the B58 in M40i tune represents the top of the used bmw x4 for sale replacement market on this page. These units are sourced specifically, checked extensively, and priced to reflect their performance specification. Contact our team directly at (888) 618-8881 for current M40i inventory before placing any order.
Generation Boundary F26 vs G02
The F26 and G02 share the same body dimensions but use completely different engine families. An N20 will not install into a G02 chassis. A B58 will not install into an F26 chassis without extensive modification. The generation boundary is 2018 to 2019. If your bmw x4 is a late 2018 or early 2019 model production date from your VIN rather than model year confirms your generation. Our team checks this specifically on every order placed near this boundary.
What the Order Covers
3-year or 30,000-mile warranty from installation on every used engine we ship. Free delivery to any commercial address across the United States in business days. No core charges the listed price is the paid price with nothing added at checkout. Cashback guarantee from delivery date. Financing available through our website for owners managing higher-value engine replacement costs.
How do I confirm my exact engine code?
The last seven digits of your VIN identify your engine family. For F26 N20 for 28ix, N55 for 35i and first-generation M40i. For G02 B48 for 30i, B58 for 40i and current M40i. Call our team with your full VIN and we confirm your exact engine specification before any order is placed.
N55 HPFP failure is this covered under the replacement warranty?
The replacement x4 engine unit ships with every component intact and HPFP tested before dispatch. Our 3-year warranty covers the engine as shipped. If the original failure was fuel pump related, our team sources a replacement unit with a specifically clean HPFP test result we note this on your order confirmation.
B58 intake valve carbon should I be concerned after installing a replacement?
On the replacement unit from our inventory no, provided it passes our intake valve assessment before dispatch. Going forward the B58 benefits from periodic intake cleaning every 40,000 to 50,000 miles in mixed city and highway use. Port injection wash is absent on direct injection engines and carbon accumulation is usage-dependent rather than a defect.
Is the M40i engine the same as the standard 3.0L?
Same B58 block and head family, different software calibration and supporting hardware in M40i specification. A standard B58 installed into an M40i chassis will run correctly but will not produce M40i output figures without recalibration. Our team discusses this with every M40i order before confirming the specification.
Select your year from the listings above or call (888) 618-8881. Give us your full VIN and we confirm your exact engine code, check current inventory, and ship with a warranty that matches the standard the X4 deserves.