BMW E81 E87 E90 LCI 118i 318i 116i 316i 2.0 N43 Bare Engine N43B20AY 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 LCI 118i 318i 116i 316i 2.0 N43 Bare Engine N43B20AY WARRANTY is a used, complete powertrain from the N43 family, designed for popular 1 Series and 3 Series models. This four-cylinder petrol unit ensures efficient, smooth operation and fits well with the requirements of daily use. It is a solution for users looking for a technically compatible BMW engine while maintaining a favorable cost-to-functionality ratio.

Specifications and technical data

• SKU: 0427103
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 0427103
• Substitutable numbers: 11000427103, 0427103, 11000427104, 0427104, 116i316i122HP, N43B20A, N43, 11002450323, 2450323, N43B20
• Fuel type: Petrol
• Number of cylinders: 4
• Category: Engines
• Mileage: 59 000

Technical characteristics of the N43B20 engine

The presented engine belongs to the Engines category and represents the N43 family used in petrol versions of the BMW 1 Series and 3 Series. The four-cylinder petrol construction provides good refinement, predictable torque characteristics, and appropriate flexibility in typical RPM ranges. The N43B20AY unit is designed for efficient fuel consumption while maintaining proper dynamics, making it well-suited for both city driving and long-distance travel.

The engine is dedicated to 118i and 318i models, which facilitates selection in terms of mechanical and electronic compatibility. The use of petrol as fuel allows for smooth operation across a wide temperature range and simpler maintenance conditions compared to more complex diesel units.

Purpose and application in BMW models

The N43B20AY unit was developed specifically for compact and mid-size BMW models, such as the E81, E87, E90, and E91 in 118i and 318i versions. This ensures that key mounting parameters are maintained, as well as compatibility with factory control systems. In practice, this means the engine serves as a suitable base for replacing a worn or damaged powertrain in these specific models.

The four-cylinder petrol engine is a good choice for drivers expecting predictable handling, moderate fuel consumption, and the typical BMW performance characteristics. A used unit with a verified mileage allows for a rational reduction in repair costs while maintaining the original drivetrain architecture.

Benefits of choosing a used BMW N43 engine

Purchasing a used engine from the N43 family for a BMW 1 Series or 3 Series is a solution that significantly reduces the cost of restoring vehicle performance compared to a brand-new unit. The original BMW design ensures proper fitment with the existing installation, which facilitates assembly and reduces the risk of compatibility issues. An additional advantage is the ability to verify compatibility using OEM and interchangeable part numbers, which allows for precise matching of the engine to a specific car configuration.

A used four-cylinder petrol engine is particularly attractive to users who want to maintain the factory driving character of their BMW while avoiding the costs of a full engine rebuild. This type of solution works well for both post-accident repairs and engine replacement due to wear and tear.

Engine selection via OEM numbers and VIN – expert knowledge

To minimize the risk of error when purchasing a used engine, it is worth using selection procedures based on OEM numbers and the vehicle's VIN. This allows for confirmation of the unit's compatibility with a specific equipment version, engine control unit, and accessories. A detailed discussion of this process, along with examples and cost analysis, can be found in the expert article Why it is worth buying used gearboxes and engines – facts instead of myths, which explains the most important technical issues and debunks popular myths.

If you want to learn more about the subject of used powertrain and body components, as well as how to consciously assess their condition and purchase profitability, the guide Used car parts: myths and facts you need to know, which describes the practical aspects of choosing second-hand parts, will also be helpful.

Expansion of upgrades in the BMW powertrain area

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other elements from the same group, such as blocks, cylinder heads, or complete powertrains, check the available parts in the BMW Engines category.