BMW F70 M135iX F74 M235iX X1 U11 M35iX Complete Engine B48A20H B48R 4k, WARRANTY

Warranty and technical condition of the part

The engine is sold with a 90-day warranty.

The warranty covers the engine itself; engine accessories are covered by a 30-day warranty.

The power unit was tested before removal and is in full working order.

Listing details

The offer applies to a complete engine.

The engine comes from a right-hand drive (RHD) vehicle. The wiring harness is not compatible with left-hand drive (LHD) vehicles and requires replacement or modification.

BMW F70 M135iX F74 M235iX X1 U11 M35iX Complete Engine B48A20H B48R is a complete powertrain from the modern BMW petrol engine family, designed for current F and U series models. The four-cylinder spark-ignition design ensures dynamic performance, high refinement, and proven compatibility with xDrive systems and M Performance sports versions. This is a solution for users who expect a technically matched engine with very low mileage and stable operating parameters.

Specifications and technical data

• SKU: 5A84230-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 5A84230
• Substitutable numbers: 5A84230, 11005A84230
• Fuel type: Petrol
• Number of cylinders: 4
• Part type: Complete Assembly
• Category: Engines
• Engine code: B48A20H B48R
• Mileage: 4 000

Intended use and unit compatibility

The presented B48 family engine has been designed as a modern, turbocharged petrol unit for BMW models with all-wheel drive and sporty handling characteristics. The M135iX, M235iX, and X1 M35iX versions use this design as a base for a dynamic yet economical powertrain, which translates into quick throttle response and stable operation across the entire rev range.

The unit is particularly valued by workshops specializing in the BMW brand for its predictable behavior, good cooperation with modern control units, and wide availability of service procedures. As a result, the engine works well both for standard replacements and in modernization projects where compliance with the factory vehicle architecture is crucial.

Construction and technical characteristics

The engine belongs to the new generation of BMW four-cylinder petrol units with direct fuel injection. The applied architecture provides a favorable compromise between weight, block rigidity, and thermal efficiency, which is important for both performance and durability. The inline four-cylinder layout facilitates servicing while allowing for precise control of the combustion process.

The modern petrol supply system and advanced engine management allow for maintaining stable parameters under various load conditions. This is important both in daily operation and in more dynamic applications typical of M Performance versions. The low mileage of the unit limits the wear of moving parts, which increases the potential for further operation after proper installation and adaptation.

Application in service practice

The BMW F70 M135iX F74 M235iX X1 U11 M35iX Complete Engine B48A20H B48R is particularly useful in situations where the existing unit has suffered serious mechanical or thermal damage and repair is no longer economically justified. Using a complete powertrain reduces vehicle downtime, simplifies the repair process, and reduces the risk of incompatibility of individual components.

In workshop practice, such a unit allows for:

• consistent replacement of the entire powertrain without the need for deep interference with internal engine components,
• easier diagnostics after installation thanks to the well-known design and widely described service procedures,
• maintaining the factory operating characteristics of the vehicle after proper adaptation in the ECU.

For the end user, this means a more predictable repair result and the possibility of restoring full vehicle functionality while maintaining the proper refinement of the powertrain.

Benefits of choosing a used BMW engine

Purchasing a used B48 family engine can be a technically justified alternative to rebuilding a heavily worn unit. Low mileage and the preserved completeness of the assembly allow for limiting the scope of additional work, and thus better controlling the total cost of the repair. For workshops and individual customers, it is also important that units of this type are well-recognized by independent services, which facilitates subsequent maintenance.

To better plan your investment in a used powertrain and understand the differences between individual solutions, it is worth reading the expert guide on selecting and operating such components – this is discussed in detail in the article Why it is worth buying used gearboxes and engines – facts instead of myths, where you will find, among other things, a description of selection procedures by identification numbers and practical cost calculation examples.

BMW engines – additional elements and expansion

If you are planning a comprehensive repair or modernization of the engine area in your BMW and need other elements from the same group, such as accessories, mounts, or additional mounting components, check the available parts in the BMW Engines category.