Mercedes-Benz W203 OM612 OM668 Diesel Engine Boost Pressure MAP Sensor

Mercedes-Benz W203 OM612 OM668 Diesel Engine Boost Pressure MAP Sensor is a precision intake system component designed for diesel engines, responsible for accurate measurement of boost pressure in the front part of the engine bay. Thanks to it, the engine control unit receives reliable data, which translates into stable engine operation, correct fuel dosing, and predictable response to load. As an original Mercedes component from the Air and fuel intake sensors category, it provides a solid foundation for professional repair or diagnostics of the boost system.

Specifications and technical data

• SKU: A0041533128
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0041533128
• Substitutable numbers: A0041533128, A 004 153 31 28
• Location on the vehicle: Front
• Fuel type: Diesel
• Offset (ET):
• Category: Air Intake & Fuel Sensors

Function and role of the boost pressure sensor in a diesel engine

The MAP-type boost pressure sensor in the OM612 engine is responsible for measuring air pressure in the intake manifold, which is crucial for the proper operation of a turbocharged diesel engine. Based on the signal from the sensor, the controller calculates the fuel dose, injection timing, and turbine operation strategy, which affects:

• maintaining stable idle speed,
• smooth acceleration without jerking,
• reducing excessive exhaust smoke,
• protecting the turbocharger from incorrect boost pressure.

A functional MAP sensor in the intake system allows for maintaining the factory operating parameters of the OM612 unit, which is particularly important in used Mercedes mid-range and luxury vehicles.

Purpose, installation, and compatibility

The presented sensor is intended for use in the front part of the vehicle, within the intake system of the diesel engine. The design based on the factory Mercedes standard facilitates installation in place of a worn-out element, without the need for installation modifications or additional adapters. Thanks to the preservation of the original geometry and electrical connectors, it is possible to achieve:

• direct fitment to the intake manifold or pressure hose,
• proper sealing in the boost system,
• stable mounting resistant to vibrations and temperature.

Proper selection based on manufacturer markings and OM612 engine parameters minimizes the risk of controller errors and adaptation problems after replacement.

Performance characteristics and advantages of using an original part

As an element from the Air and fuel intake sensors group, this boost pressure sensor has been designed for long-term operation in demanding thermal and pressure conditions. Using an original Mercedes component instead of a replacement allows you to obtain:

• signal consistency with other sensors in the engine control system,
• better repeatability of pressure readings across the entire load range,
• reduced risk of diagnostic errors related to an incorrect MAP signal.

A used, functional sensor is a reasonable choice for maintenance repairs when you want to keep the original electronics while optimizing service costs.

Professional diagnostics and OEM selection

When replacing the boost pressure sensor in a Mercedes with an OM612 engine, it is crucial to match it by OEM number and compatibility with the specific version of the power unit. Proper selection eliminates problems with adaptation, controller errors, and incorrect boost characteristics. If you want to deepen your knowledge about the conscious choice of used electronic components, selection by manufacturer markings, and installation principles, check out the guide Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?, where you will find practical tips regarding sensors and control modules.

Expansion of the intake system in a Mercedes

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other elements from the same group, such as additional pressure sensors, air temperature measurement elements, or mixture control components, check the available parts in the Mercedes air and fuel intake sensors category.

For drivers interested in a broader market context and the trend of using used original components in premium cars, a valuable supplement will be the article Crisis in the new parts market? Why in 2026 used originals for premium cars (BMW, Mercedes, Porsche) are the hottest trend, which shows how to reasonably plan repairs based on proven OEM components.