Mercedes ML W164 W221 W251 OM642 CDI Altenator Generator 14V 220A A0131540902

Mercedes ML W164 W221 W251 OM642 CDI Altenator 14V 220A is a factory-original charging system component from the Alternators and Generators group, designed for Mercedes vehicles with the OM642 CDI engine. The offered used unit is a functional service solution for drivers seeking parts that retain their original operating characteristics and proper fit for the vehicle's electrical system.

Specifications and technical data

• SKU: A0131540902
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0131540902
• Substitutable numbers: A0131540902, A 013 154 09 02
• Part type: Alternator
• Category: Alternators & Generators

Intended Use and Compatibility with Mercedes Models

The presented alternator has been designed for Mercedes ML W164 class vehicles, W221 S-Class sedans, and R W251 models equipped with the OM642 CDI diesel engine. The construction is intended for cooperation with a 14-volt electrical system and the energy management systems used in these vehicle generations, ensuring stable battery charging and proper operation of electrical consumers.

Thanks to the use of original mounting architecture and an appropriate drive pulley profile, the alternator integrates seamlessly with the factory engine accessories, minimizing the risk of belt tensioner issues, misalignment, or improper tensioner operation. This solution is particularly beneficial for repairs where maintaining the parameters specified by the vehicle manufacturer is crucial.

Operating Characteristics and Performance Parameters

This alternator belongs to the group of high-current output components, which is important for premium vehicles equipped with extensive electronics, comfort systems, and numerous additional consumers. The use of an appropriately selected output current ensures stable power supply to onboard systems even under heavy load, reducing the risk of voltage drops and starting problems.

The excitation system and integrated control electronics are adapted to the specific control requirements of the OM642 CDI engine, promoting proper cooperation with control modules and energy management systems. As a result, the alternator maintains the correct voltage level under various operating conditions – from city driving to long journeys with numerous active consumers.

Condition, Verification, and Service Application

The offered alternator is a used component, making it a sensible choice for repairs where a combination of functionality and cost control is key. This type of part allows for the restoration of the charging system's efficiency without the need to invest in a new component, while maintaining original construction and mounting compatibility.

In workshop practice, this type of alternator is used both as a replacement for a damaged unit and as a component utilized in comprehensive engine accessory repairs, including the replacement of the belt, idler pulleys, or tensioner. A used OEM component helps maintain system integrity and reduces the risk of problems arising from improper fit.

Benefits of Using an Original Mercedes Alternator

Using an original alternator in Mercedes vehicles with the OM642 CDI engine offers a number of technical advantages:

• maintaining factory charging characteristics and stable voltage in the electrical system,
• secure fit to mountings, accessories, and the wiring harness in the engine bay,
• reduced risk of communication errors with control modules,
• consistency with other powertrain components and electrical accessories.

For users considering the choice between new, aftermarket, or used parts, a comparative analysis describing the differences in cost, quality, and fit may be helpful. More information can be found in the article Original, Aftermarket, or Used – Which Car Parts Are Most Cost-Effective?.

Mercedes Alternators and Generators – Charging System Expansion and Modernization

If you are planning a comprehensive engine area repair or modernization for your Mercedes and need other components from the same group, such as additional charging units, alternators with different capacities, or compatible generators, check the available parts in the Mercedes Alternators and Generators category.