BMW 5 7 E60 E61 E65 M57N M57N2 Compact Alternator Generator Valeo 170A 7802929

BMW 5 7 E60 E61 E65 M57N M57N2 Compact Alternator Generator Valeo 170A is an original component from the Alternators and generators group, designed for BMW diesel engines from the M57N and M57N2 families. This is a solution for users who expect a stable power supply for the electrical system and the proper operation of all onboard systems in premium-class vehicles.

Specifications and technical data

• SKU: 7802929-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7802929
• Substitutable numbers: 12317802929, 7802929, BG
• Category: Alternators & Generators

Purpose and function of the alternator

The alternator in M57N and M57N2 units is responsible for converting the engine's mechanical energy into electrical energy, powering the starting system, comfort electronics, safety systems, and battery charging. Using a dedicated generator for specific BMW engine series allows for maintaining proper charging parameters under typical diesel operating conditions – from city driving to long highway trips.

Thanks to a design that meets the manufacturer's standards, the alternator works with factory engine accessories, the belt system, and electronic controls, which reduces the risk of compatibility issues and improper charging.

Benefits of using an original BMW alternator

Choosing an alternator from the BMW group ensures the maintenance of factory electrical system performance parameters. The original generator is designed for the specific loads typical of E60 and E65 models with M57N/M57N2 engines, which translates into stable voltage, proper cooperation with control modules, and a lower risk of electronic interference.

Key advantages of this solution include:

• consistency with the vehicle's factory electrical architecture,
• properly selected charging characteristics for the diesel engine,
• maintenance of correct cooperation with BMW diagnostic systems.

Product condition and service application

The offered alternator is a used component, which allows for an economical repair of the charging system while maintaining the original manufacturer's specifications. This type of part is suitable both for a typical replacement of a worn-out generator and for broader service work related to the drivetrain in BMW E60 and E65 cars with M57N/M57N2 engines.

In practice, this means the ability to restore the proper operation of the electrical system without the need to use replacements with uncertain parameters, which is particularly important in premium-class vehicles with extensive electronics.

Selection and compatibility within the Alternators and generators group

Alternators used in modern BMW diesel units are precisely selected in terms of power, control method, and cooperation with engine accessories. When selecting the correct generator for an E60 or E65 with an M57N/M57N2 engine, it is crucial to rely on manufacturer data and part numbers assigned to the specific vehicle configuration, which helps avoid problems with installation and charging system operation.

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 additional generators, mounting elements, or compatible units, check the available parts in the BMW Alternators and generators category.

Expert support and the trend for original used parts

The growing importance of original second-hand components in the premium car segment results from their fitment to the specific vehicle specification and predictable behavior during operation. In the case of brands like BMW, properly selected used alternators allow for maintaining a high level of reliability at rational service costs.

To better understand why original used components for premium-class cars are becoming an increasingly popular choice, it is worth reading the article Crisis in the new parts market? Why in 2026 used originals for premium cars (BMW, Mercedes, Porsche) are the hottest trend, which discusses current trends and a practical approach to repairs based on OEM components.