Mercedes W203 W204 W211 MAP Pressure Sensor Air Intake Unit 0261230189 Bosch

Mercedes W203 W204 W211 MAP Pressure Sensor Air Intake Unit is a high-precision component from the Air and fuel intake sensors category, responsible for accurate pressure measurement in the intake manifold. A properly functioning MAP sensor supports stable engine operation, optimizes fuel dosage, and improves engine performance. This original used Bosch component is a sensible choice for diagnosing and repairing the intake system in Mercedes C-Class and E-Class vehicles.

Specifications and technical data

• SKU: 0261230189
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: 0261230189
• Substitutable numbers: 0261230189
• Location on the vehicle: Front
• Category: Air Intake & Fuel Sensors

Function and role of the MAP sensor in a Mercedes

The MAP pressure sensor in Mercedes W203, W204, and W211 models is responsible for measuring air pressure in the intake manifold and transmitting this data to the engine control unit (ECU). Based on the sensor signal, the ECU determines the fuel dosage, injection timing, and boost strategy, which results in:

• stable idle speed and smooth acceleration,
• more predictable throttle response,
• reduction in exhaust smoke and power loss under load,
• more efficient use of boost in turbocharged engines.

A functional MAP sensor helps maintain correct combustion parameters, which is important for both performance and engine longevity.

Vehicle placement and installation aspects

The presented sensor is designed for installation in the front part of the vehicle, within the intake system area. This location facilitates access during diagnostics and replacement while ensuring a reliable reading of the air pressure being drawn into the engine.

During installation, it is worth paying attention to:

• proper seating of the sensor in the manifold socket or intake pipe,
• cleanliness of the contact surface and absence of debris in the measuring channel,
• secure connection of the electrical harness, without looseness or insulation damage.

By following these principles, the sensor can operate stably, and the engine control unit receives a reliable input signal.

Benefits of using an original Bosch sensor

In Mercedes intake systems, the repeatability of measurement characteristics and electrical compatibility with the factory ECU are particularly important. Using an original Bosch solution ensures:

• signal characteristic compliance with the requirements of the engine control unit used in Mercedes W203, W204, and W211,
• stable operation across a wide range of temperatures and operating pressures,
• reduced risk of diagnostic errors in the ECU memory (errors related to boost pressure or air-fuel mixture),
• easier data interpretation during computer diagnostics.

Choosing an original used Bosch sensor is often more predictable than installing cheap replacements with uncertain characteristics.

Application in service practice

The MAP sensor in Mercedes C-Class and E-Class vehicles is one of the first components checked when symptoms such as power loss, limp mode, unstable engine operation, or increased fuel consumption occur. Replacing this component is relatively simple and can significantly improve vehicle behavior in daily use.

In service practice, the boost pressure sensor is often replaced in parallel with cleaning the intake system, checking vacuum lines, and diagnosing the fuel system. Properly combining these actions allows for restoring the factory operating parameters of the engine.

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 air temperature sensors, mass air flow sensors, or additional pressure sensors, check the available parts in the Mercedes air and fuel intake sensors category.

Selection and diagnostics in the context of the fuel system

When dealing with issues regarding vehicle dynamics and the air-fuel mixture, it is worth simultaneously verifying the condition of the fuel system – injectors, pumps, and the fuel tank. A properly functioning MAP sensor works in conjunction with these components, and their overall condition determines the final result of the repair.

To better understand the relationships between boost pressure, fuel dosage, and injector operation, the following service guide will be helpful: Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration. It will make it easier for you to plan diagnostics and select parts based on OEM numbers and measurement results.