BMW 3 Series E46 318i N42 143HP Complete Engine N42B20A New Timing 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 3 Series E46 318i N42 143HP Complete Engine N42B20A New Timing WARRANTY is a factory petrol unit prepared for installation in 3 Series E46 models with the 143 HP N42 engine. This is a solution for users looking for a proven, complete engine block with a new timing system who want to restore full powertrain efficiency without the costly refurbishment of an old unit.

Specifications and technical data

• SKU: 0391085-3
• 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

Technical characteristics of the N42B20A engine

The offered engine belongs to the Engines category and is designed to run on petrol. The four-cylinder design ensures a good balance between refinement and fuel economy, while the new timing system minimizes the risk of failures typical for worn-out units of this type. As a result, the engine is suitable for both daily commuting and dynamic driving in typical road conditions.

The unit is complete, which facilitates the replacement process in the workshop and reduces vehicle downtime. The use of compatible components allows for maintaining factory performance parameters and proper interaction with the vehicle's electronics.

Purpose and compatibility

The BMW 3 Series E46 318i N42 143HP Complete Engine N42B20A New Timing WARRANTY has been designed for the BMW 3 Series E46 in the 318i version, which originally used a 143 HP four-cylinder petrol unit. It is the right choice when the existing engine has suffered mechanical damage, has excessive oil consumption, or when a major overhaul is no longer economically justified.

By maintaining the original specification, the unit works with factory accessories, the engine control unit, and the vehicle's wiring, which simplifies installation and limits the need for additional modifications. In practice, this allows for the restoration of factory performance and proper powertrain operation without experimenting with mismatched replacements.

Advantages of purchasing a complete used engine

Choosing a complete used engine with a new timing system is often more cost-effective than repairing a heavily worn unit. Key benefits include:

• Cost reduction compared to a full overhaul or purchasing a brand-new engine.
• The possibility of a quick replacement of the entire unit, which shortens vehicle downtime.
• Better control over technical condition – the engine can be verified before installation in the vehicle.
• A new timing system, which reduces the risk of failures associated with chain or tensioner wear.

Additionally, using a unit consistent with factory specifications facilitates subsequent computer diagnostics and service according to standard workshop procedures.

OEM selection and technical support

To correctly select an engine for a specific BMW E46 318i, it is worth using the OEM number, interchangeable numbers, and the vehicle's VIN data. This helps avoid compatibility issues with accessories, wiring harnesses, and the ECU. In case of doubt, a good solution is to consult a mechanic or technical advisor who will verify the unit's compatibility with the specific car configuration.

If you want to better understand how to safely buy used power units and what to pay attention to when selecting by VIN and OEM numbers, check out the guide Why it is worth buying used gearboxes and engines – facts instead of myths, where you will find practical tips, cost examples, and checklists useful before purchase.

Expansion and modernization of the BMW powertrain

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

For users interested in more advanced tuning projects in newer 3 Series generations, a guide to turbocharged units and charge air cooling accessories may also be useful, available in the article BMW B58 code, or 340 HP from the secondary market – a checklist before buying a turbocharger and intercooler for the BMW 3 Series (G20), which shows how to approach powertrain modernization in an orderly and safe manner.