BMW E81 E87 E90 E91 120i 320i N43 170HP Bare Engine N43B20A 31k miles, WARRANTY

Warranty and technical condition of the part

The engine is sold with a 90-day warranty.

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

Listing details

The offer applies to a bare engine.

The engine is sold without accessories (e.g. alternator, starter motor, manifolds, injectors, turbocharger, etc.).

BMW E81 E87 E90 E91 120i 320i N43 170HP Bare Engine N43B20A 31k miles, WARRANTY is a low-mileage used power unit designed for popular 1 and 3 Series models. Thanks to its modern design, petrol fuel system, and four-cylinder layout, the engine ensures efficient, dynamic, and economical performance in daily operation. This is a solution for users looking for a technically compatible engine block for repair or replacement in their BMW.

Specifications and technical data

• SKU: 0427105-4
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 0427105
• Substitutable numbers: 11000427105, 0427105, 11000427106, 0427106, 11002450324, 2450324
• Fuel type: Petrol
• Number of cylinders: 4
• Category: Engines
• Mileage: 29 000

Purpose and compatibility

The offered engine is dedicated to BMW 1 Series E87 120i and BMW 3 Series E90 320i models equipped with the N43B20A unit. The design based on four cylinders in an inline configuration is characteristic of this generation of BMW petrol engines, which facilitates selection and installation in vehicles factory-equipped with this unit.

The engine belongs to the Engines category, which means it is a complete power unit intended for replacing a damaged unit in a vehicle, rather than individual accessories. Low mileage combined with a modern petrol design makes it an attractive base for further operation or professional refurbishment.

Technical characteristics of the N43B20A unit

The N43B20A engine is a four-cylinder petrol unit designed to combine reasonable fuel consumption with proper operating refinement. The four-cylinder layout promotes smooth power delivery and predictable torque characteristics, which translates into stable vehicle behavior across the entire rev range.

This generation of petrol units works well with both manual and automatic transmissions used in the E87 and E90, making it a flexible service solution. The low mileage of the engine means less wear on internal components compared to typical examples from the secondary market, which is important when planning long-term operation.

Benefits of installing a used BMW engine

Choosing a used engine from the Engines category allows you to significantly reduce repair costs compared to purchasing a brand-new unit. With proper selection based on the engine code and verification of compatibility with the vehicle's equipment, such a replacement is a technically safe and economically justified solution.

The main advantages of installing this unit include:

• the ability to restore full drivetrain performance without the need for a major overhaul of the existing engine,
• maintaining the original operating characteristics typical of BMW petrol units,
• easier availability of service and maintenance parts for this popular engine type,
• lower total repair cost compared to brand-new alternatives.

For users planning a conscious car repair, it is also important that the unit comes from the OEM segment, which facilitates proper fitment to the vehicle's factory installation.

Selection by numbers and technical support

When selecting an engine for a specific BMW vehicle, it is crucial to compare the power unit designation and part numbers with the vehicle documentation or the manufacturer's catalog. Proper matching based on OEM and interchangeable numbers minimizes the risk of installation problems and incompatibility with the car's electronics.

If you want to better understand how to safely buy used power units and what to look for when verifying designations, check out the guide Why it is worth buying used gearboxes and engines – facts instead of myths. It provides a practical discussion of selection procedures based on VIN and OEM numbers, differences between individual variants, and real repair costs.

BMW engine zone – other items in this group

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other components from the same group, such as additional engine blocks, units with similar displacement, or alternative petrol drivetrain variants, check out the available parts in the BMW Engines category.

How to take care of a used engine after installation

To maximize the potential of this unit, it is worth performing basic service tasks after installation: changing the oil and filters, checking the cooling system, and verifying the tightness of the fuel system. Such actions help stabilize engine operating conditions and reduce wear in the first few thousand kilometers after installation.

Additional tips on the operation and maintenance of used components can be found in the article How to extend the life of used car parts?, which describes practical methods for taking care of dismantled engines, including recommendations for regular inspections and preventive maintenance.