Exhaust Hose Mercedes ML W166 Diesel OM642 Exhaust Gas Pressure Sensor Hose

Exhaust Hose Mercedes ML W166 Diesel OM642 Exhaust Gas Pressure Sensor Hose is a specialized exhaust system component designed to precisely deliver the exhaust gas pressure signal to the sensor in diesel engines. Thanks to its carefully selected geometry and material, it ensures stable measurement conditions, which supports the proper operation of the engine control unit and exhaust gas aftertreatment systems in the Mercedes ML W166 generation with the OM642 engine.

Specifications and technical data

• SKU: A1664920159
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1664920159
• Substitutable numbers: A1664920159, A 166 492 01 59
• Fuel type: Diesel
• Category: Hoses, Lines & Pipes

Purpose and function in the exhaust system

The presented Exhaust Hose Mercedes ML W166 Diesel OM642 Exhaust Gas Pressure Sensor Hose operates in the immediate vicinity of the exhaust system, where it is responsible for stably transmitting exhaust gas pressure to the measuring sensor. In a diesel engine, such as the OM642, an accurate pressure reading is crucial for the operation of fuel dosage control systems, exhaust gas recirculation, and components responsible for emission reduction.

A properly selected hose in this section of the system:

• reduces the risk of measurement signal interference,
• supports the maintenance of correct operating parameters for turbocharging and exhaust gas aftertreatment systems,
• helps minimize diagnostic errors related to incorrect pressure readings.

Technical characteristics and fitment

The hose belongs to the Lines, hoses, and pipes group, which means it has been designed to operate in an environment exposed to temperature fluctuations, vibrations, and contact with combustion products. The hose construction is adapted to the specifics of a diesel engine, where pressures and temperatures in the exhaust system are significantly higher than in gasoline units.

The component is intended for Mercedes vehicles, which ensures:

• proper routing in the engine bay without collision with other components,
• compatibility with the factory placement of the exhaust gas pressure sensor,
• consistency with the original exhaust system architecture in the ML W166 model.

Benefits of using the original hose

Using a dedicated exhaust gas pressure sensor hose in a diesel engine allows for maintaining stable operating conditions for the power unit. In practice, this translates into:

• more predictable vehicle behavior under load,
• more efficient operation of emission control systems,
• easier diagnostics of potential faults related to the exhaust system.

For users of Mercedes ML W166 vehicles with the OM642 unit, replacing a worn or leaking hose with the correct element from this group is one of the fundamental steps in resolving issues with exhaust gas pressure sensor errors, power loss, or rough engine operation.

Component condition and service application

The offered hose comes from the used parts group, which constitutes an attractive service solution for drivers looking for technically sound components at a reasonable price. In practice, this allows for restoring the proper operation of the exhaust system without the need to invest in a new element, while maintaining compliance with the vehicle's factory specifications.

Replacing the exhaust gas pressure sensor hose is particularly recommended in situations where:

• diagnostic errors related to exhaust gas pressure measurement occur,
• visible signs of overheating or mechanical damage to the existing hose are present,
• the vehicle is operated mainly in urban conditions, which favor faster wear of exhaust system components.

System expansion – related components

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 additional vacuum lines, cooling system hoses, or breather pipes, check the available parts in the Mercedes lines, hoses, and pipes category.

For drivers interested in optimizing vehicle maintenance costs and making informed choices regarding spare parts, practical tips on economical operation and repair planning may also be useful – you can find them in the article Economical operation of a Ford – where to look for the greatest savings in mechanical and body repairs, the tips of which can also be applied to other brands, including Mercedes.