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.

BMW 1 3 Series e81 e87 LCI e90 120i 320i 170HP Complete Engine N43B20AA WARRANTY designed for BMW 1 Series E81/E87 LCI and 3 Series E90 120i/320i models with 170HP is a factory petrol unit, ideal for professional powertrain replacement. The four-cylinder design ensures smooth operation, and the favorable mileage of this used unit makes it an attractive service solution for demanding BMW users.

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 N43B20AA engine was designed as a petrol unit for BMW 1 Series E81/E87 LCI and BMW 3 Series E90 models in 120i and 320i versions with 170HP. It is an original engine from the N43 family, used factory-standard in these models, which translates into a perfect fit for stock auxiliary systems, electronics, and control units.

Thanks to maintaining factory specifications, the unit is suitable both for a standard replacement of a damaged engine and for professional vehicle repair after a powertrain failure, while preserving original performance parameters.

Construction and technical characteristics

The engine belongs to the Engines category and is a four-cylinder petrol unit with a modern design, optimized for efficiency and refinement. The four-cylinder layout promotes balance, and the petrol configuration ensures good throttle response and predictable behavior across the entire rev range.

The unit is complete, which facilitates the installation process in the vehicle and limits the need for additional equipment. This type of solution is particularly beneficial in workshops specializing in the BMW brand, where installation time and repeatability of the repair result are key.

Condition, mileage, and service application

The engine is used, with documented mileage, which allows for a realistic assessment of its operational potential. This type of unit is suitable for situations where repairing the existing engine is unprofitable or technically difficult, and the priority is to restore full vehicle functionality at reasonable costs.

In workshop practice, such a complete petrol engine for BMW 1 Series and 3 Series is often chosen as a solution that allows for shortening vehicle downtime and limiting the risk of additional surprises associated with extensive regeneration of an old unit.

Benefits of choosing the BMW 1 3 Series e81 e87 LCI e90 120i 320i 170HP Complete Engine N43B20AA WARRANTY

• Original BMW unit – preservation of factory operating characteristics and compatibility with vehicle electronics.
• Complete configuration – simplified installation and fewer additional components to match.
• Petrol unit – predictable behavior, good refinement, and wide service availability.
• Four-cylinder design – a favorable compromise between dynamics and economy of use.
• Reasonable cost solution – an attractive alternative to a full rebuild of a damaged engine.

Selection by numbers and technical support

To correctly match this engine to a specific BMW vehicle, it is crucial to verify compatibility by OEM number and interchangeable numbers, as well as by the vehicle's VIN. In case of doubt, it is worth using the procedures described in the expert guide how to choose the right car part by VIN and OEM number, which explains the compatibility verification process step by step.

If you are considering installing a used powertrain and want to learn reliable technical and economic arguments, the article Why it is worth buying used gearboxes and engines – facts instead of myths, discussing, among other things, cost ratios, typical inspection procedures, and the most common myths regarding used engines, will be helpful.

Expanding engine repairs in your BMW

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 blocks, cylinder heads, or complete powertrains, check out the available parts in the BMW Engines category.