Mercedes W164 W204 C207 W212 W221 W639 Fuel Injector OM642 Diesel 0986435404

Mercedes W204 W212 W221 Bosch Fuel Injector OM642 Diesel 0986435404 is a used injector nozzle designed for OM642 diesel engines, used in popular Mercedes C-Class, E-Class, and S-Class models. This component allows for the restoration of proper fuel delivery in the common rail system, which translates to stable engine operation and a smooth driving experience.

Specifications and technical data

• SKU: A6420701187-1
• Mark: Unbranded
• Condition: Used
• OEM Part Number: A6420701187
• Substitutable numbers: A6420701187, A 642 070 11 87, 0986435404, 0 986 435 404
• Fuel type: Diesel
• Category: Fuel Injectors

Injector Application and Purpose

The presented fuel injector for OM642 engine belongs to the Injector Nozzles category and is compatible with diesel engines installed in Mercedes W204, W212, and W221 series vehicles. Using a dedicated injector for a specific engine type helps maintain the correct operating parameters of the injection system, reduces the risk of uneven idling, and improves throttle response.

The injector works with a Diesel fuel supply system, ensuring precise fuel atomization in the combustion chamber. A properly selected injector nozzle is crucial for maintaining correct pressure in the common rail, reducing smoke, and preserving the engine's factory performance.

Technical and Construction Characteristics

The injector has been designed for demanding diesel engines where precise fuel metering across a wide range of loads is essential. The construction, based on Bosch technology, allows for stable operation at high working pressures typical of modern common rail systems.

Key design advantages include:

• Precise fuel atomization – improves the combustion process and reduces carbon buildup.
• Designed for OM642 engine – ensures correct injection characteristics across the entire RPM range.
• Can be used as a replacement within specified reference numbers – simplifies part selection in professional workshops.

Thanks to the appropriate geometry of the injector tip and its compatibility with engine control unit parameters, the injector helps maintain smooth operation of all cylinders, which is important for both engine durability and driving comfort.

Condition, Verification, and Part Selection

The offered component is a used injector nozzle, making it an attractive solution for users looking for a technically sound component at a favorable price compared to brand-new parts. Before installation, a standard injector diagnostic procedure (leak-off test, operating parameter check on a test bench) is recommended to confirm compatibility with the specific engine requirements.

When selecting an injector for a Mercedes with an OM642 engine, pay attention to:

• compatibility with Diesel fuel type,
• assignment to W204, W212, or W221 body series,
• appropriate part numbers and interchangeable numbers visible in the product's technical specifications.

This approach minimizes the risk of engine starting problems, control unit errors, and uneven engine operation after injector replacement.

Benefits of Using a Dedicated Injector Nozzle

A properly selected fuel injector for Mercedes OM642 allows for maintaining engine operating parameters close to factory specifications. The most important benefits include:

• stable engine operation – reduced vibrations and misfires at idle,
• improved throttle response – faster torque build-up during acceleration,
• more uniform mixture combustion – which can translate to lower fuel consumption and reduced exhaust smoke,
• maintained proper interaction with engine electronics – the control unit receives predictable injection parameters.

For workshops and individual users, this means the possibility of effectively repairing the injection system without the need for a costly replacement of the entire injector set.

Other Injector Nozzles from this Brand

If you are looking for other Unbranded injector nozzles for similar applications, check out the Unbranded injector nozzles available in our assortment to select the right set for your fuel system.

For a comprehensive approach to vehicle servicing, it is also worth familiarizing yourself with educational materials. In our guide, we explain how the steering system works, what are the typical signs of wear, and how to select used components – details can be found in the article “Steering System and Power Steering – How it Works and What Fails?”.