BMW 1 3 Series e81 e87 LCI e90 120i 320i 170HP Complete Engine N43B20AA 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.

The BMW 1 3 Series e81 e87 LCI e90 120i 320i 170HP Complete Engine N43B20AA WARRANTY is a used petrol unit designed for BMW 1 Series E81/E87 LCI and 3 Series E90 120i and 320i models with 170 HP. It is a solution for users looking for a technically matched, original engine block with accessories, which will allow for an efficient replacement of a damaged power unit without the costly regeneration of the old engine. Thanks to the preservation of factory specifications, the engine works perfectly with the factory electronics and drivetrain of these models.

Specifications and technical data

• SKU: 0427105-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 427105
• Substitutable numbers: 11000427105, 0427105, 11000427106, 0427106, 11002450324, 2450324
• Fuel type: Petrol
• Number of cylinders: 4
• Category: Engines
• Mileage: 59 000

Purpose and compatibility

The offered engine comes from the BMW Engines group and is structurally matched to the 120i and 320i versions from the N43B20AA family. The unit has been designed to work with the factory ECU, wiring harness, and accessories characteristic of this generation of the 1 Series and 3 Series, which facilitates installation in place of a damaged engine without the need for major mechanical modifications.

The engine belongs to modern, four-cylinder BMW petrol designs, which translates into good operating culture, reasonable fuel consumption, and predictable behavior across the entire rev range. Using this unit as a replacement allows for restoring the full efficiency of the drivetrain while maintaining factory power parameters and characteristics.

Construction and technical characteristics

The N43B20AA unit is a four-cylinder petrol engine, which provides a favorable compromise between dynamics and the weight of the powertrain. This configuration is standard in compact and mid-size BMW models, ensuring predictable loads for the gearbox, cooling system, and accessory drive.

The engine is complete, which in practice means that it is a ready-to-install assembly for the engine bay, limiting the scope of additional workshop work. Thanks to this, the mechanic can focus on proper installation, replacement of consumables, and adaptation of the unit to the existing vehicle installation.

Condition, mileage, and benefits of choosing a used engine

The offered unit is a used product, which allows for significantly reducing repair costs compared to purchasing a brand-new engine or a full overhaul. The declared mileage is typical for units operated under road conditions and allows for further, rational operation after proper installation and initial service (replacement of oil, filters, spark plugs, fluids).

Choosing a used OEM engine also offers technical benefits: preservation of the original specification, full compatibility with factory ECU maps, and predictable behavior in the long term. For workshops, this means a lower risk of adaptation problems, and for the user – a faster return of the car to full working order.

Professional selection by part numbers and technical support

To ensure proper fitment, it is recommended to verify the unit by OEM number, interchangeable numbers, and vehicle data (VIN). This selection method minimizes the risk of accessory incompatibility, differences in mounts, or different equipment versions. In case of doubt, it is worth consulting a workshop specializing in the BMW brand, which will confirm the compatibility of a specific unit with a given car.

For those who want to better understand how to safely buy used power units and what to pay attention to when selecting by VIN or OEM numbers, the expert guide Why it is worth buying used gearboxes and engines – facts instead of myths, which discusses verification procedures, common myths, and repair cost ratios, will be helpful.

Expanding repairs within the BMW drivetrain

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 power units, engine blocks, or complete powertrains, check out the available parts in the BMW Engines category.