BMW 3 Series E46 318i 318Ci Petrol N42 143HP Complete Engine N42B20A 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.).

The BMW 3 Series E46 318i 318Ci Petrol N42 143HP Complete Engine N42B20A WARRANTY is a factory-spec powertrain unit designed for 3 Series models equipped with the 143 HP N42 engine. This is the ideal solution for users looking to restore the full performance of their drivetrain while maintaining the original engine operating characteristics and compatibility with BMW's factory electronics.

Specifications and technical data

• SKU: 0391085-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 0391085
• Substitutable numbers: 11000391085, 0391085, 11000304935, 11007519601, 11007516422, 11000391086, 11000304936, 11007519602, 11007516423, 0304935, 7519601, 7516422, 0391086, 0304936, 7519602, 7516423
• Fuel type: Petrol
• Number of cylinders: 4
• Category: Engines
• Mileage: 59 000

Purpose and compatibility

The offered complete engine is dedicated to BMW 3 Series E46 318i and 318Ci models with the N42B20A unit. The design is engineered to work seamlessly with the factory accessories, engine control unit (ECU), and electrical system of these versions, which facilitates installation and minimizes the need for additional modifications.

This unit belongs to the Engines category, meaning it is a complete powertrain assembly rather than a single accessory component. As such, it provides a solid foundation for replacing a worn-out or damaged engine in E46 family vehicles.

Technical characteristics of the N42B20A unit

The N42B20A engine is a modern, four-cylinder petrol unit that combines refined operation with reasonable dynamics. The use of an inline four-cylinder layout ensures balanced mechanical loads and predictable behavior across various RPM ranges.

The unit runs on petrol, allowing for smooth power delivery and flexibility in typical road conditions. The design solutions applied in the N42 series were developed with a focus on efficient power utilization while maintaining proper refinement and precise throttle response.

Condition, mileage, and practical application

The engine comes from a used vehicle, which is significant from the perspective of repair economics – it allows for a significant reduction in the cost of restoring the car's functionality compared to purchasing a brand-new unit. The declared mileage of this unit is appropriately low for an engine of this generation, which increases its operational potential for years to come.

In practice, such a complete engine is suitable for situations where the existing unit has suffered a major mechanical failure or would require an uneconomical complete overhaul. Replacing it with a complete unit from the same engine family allows you to maintain factory operating parameters and avoid issues with component matching.

Benefits of choosing a complete used engine

Purchasing a complete, used engine for a BMW E46 is a solution that combines technical and economic aspects. Instead of an extensive overhaul that requires many new parts and labor hours, you receive a ready-to-install powertrain unit with preserved structural integrity. This is particularly beneficial for modern engines, where assembly precision and component compatibility are crucial for durability.

To better understand the differences between an overhaul and replacing with a used unit, and to learn about selection procedures based on OEM and VIN numbers, it is worth checking out our expert guide Why it is worth buying used gearboxes and engines – facts instead of myths. The article explains how to consciously approach the purchase of a used engine and how to evaluate the profitability of such an investment.

Expansion and modernization of the BMW drivetrain

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

Choosing components from a single, consistent product group facilitates compatibility and reduces the risk of installation problems. This ensures that the entire drivetrain can operate stably, and the car retains the characteristics intended by the manufacturer.