Mercedes W166 Diesel OM642 Intercooler Outlet Hose Turbocharger Line A1665280082

Visual condition of the part 

The product shows signs of use visible in the photos. 

Mercedes W166 Diesel OM642 Intercooler Outlet Hose Turbocharger Line is a component from the Lines, hoses and pipes group, designed for the intake system in OM642 diesel engines. Designed by the vehicle manufacturer, it ensures proper routing of compressed air from the turbocharger, which translates into stable engine operation and predictable performance.

Specifications and technical data

• SKU: A1665280082
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1665280082
• Substitutable numbers: A1665280082, A 166 528 00 82
• Fuel type: Diesel
• Category: Hoses, Lines & Pipes

Purpose and function in the intake system

The turbocharger air hose in Mercedes W166 models with the OM642 diesel engine is responsible for the airtight and directional routing of compressed air between the turbocharger and the rest of the intake system. A properly selected component reduces pressure drops, minimizes the risk of leaks, and supports uniform boost across the entire rev range.

Using a dedicated hose in the boost system is crucial for:

• maintaining the correct boost pressure in the diesel engine,
• stable turbocharger operation under variable loads,
• reducing the risk of overheating components adjacent to the intake system,
• limiting power loss resulting from leaks or hose deformation.

Technical characteristics and fitment

The hose belongs to the Lines, hoses and pipes group, meaning it has been designed to operate in an environment of variable temperatures, vibrations, and pulsed pressure loads. The hose construction is adapted to the specifics of a diesel engine, where higher boost pressures occur compared to gasoline units.

Thanks to the factory design, the hose ensures:

• geometry adapted to the engine bay of the W166 body,
• proper routing relative to engine accessories,
• compatibility with the intake system of the diesel-powered OM642 unit.

Such fitment reduces stress on connections, decreases the risk of chafing, and facilitates future assembly and service.

Component condition and service application

The offered turbocharger air hose is an aftermarket component, which allows for an economical replacement of a worn or damaged hose while maintaining the correct operating parameters of the intake system. It is a practical solution in situations where symptoms such as power loss, air whistling under load, or boost pressure-related errors appear.

Hose replacement is particularly recommended when:

• cracks, fissures, or traces of oil are visible on the hose surface,
• a leak is detected in the area of connections with the turbocharger or manifold,
• a pressure drop in the circuit is detected after boost system diagnostics.

Benefits of using an original Mercedes solution

Using a hose designed specifically for the intake system in a Mercedes W166 with a diesel engine ensures consistency with other accessory components. Factory fitment translates into predictable engine behavior, correct cooperation with control electronics, and the reduction of unwanted vibrations and noise in the engine bay.

Such a solution is particularly important in modern diesel units, where precise control of boost pressure has a direct impact on refinement, fuel consumption, and exhaust emissions.

Expanding intake system and accessory service

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other components from the same group, such as intake lines, vacuum hoses, or boost system pipes, check the available parts in the Mercedes lines, hoses and pipes category.

For broader service work related to diesel engine accessories, it is also worth checking out practical tips on operation and failure prevention in diesel units of this brand – you will find them in the article Reliability under the star sign – how to take care of engine accessories in popular Mercedes-Benz C and E-Class models?.