Is the Mercedes-Benz Oil Pump Wiring Harness Easy to Replace?
2 Answers
Mercedes-Benz oil pump wiring harness is not easy to replace, and it is recommended to go to a repair shop for handling. The function of the oil pump is to raise the oil to a certain pressure and then forcibly deliver it to the moving surfaces of various engine components. The structural forms of oil pumps can be divided into two categories: gear type and rotor type. Here is more information about automotive oil pumps: Structure: Simple structure, small size, lightweight, and high oil delivery capacity. The cycloidal rotor pump adopts a meshing structure of internal and external rotors, with fewer teeth and compact structural dimensions. It can form a sealed cavity without the aid of other isolating components, and the number of parts is small. Motion characteristics: Smooth operation and low noise. The cycloidal rotor pump has only one tooth difference between the internal and external rotors. When they move relative to each other, the sliding speed of the tooth surface is small, and the meshing point continuously moves along the tooth profiles of the internal and external rotors, resulting in less mutual wear between the two rotor tooth surfaces. Due to the large enveloping angle of the oil suction and discharge chambers, close to 145 degrees, the oil suction and discharge times are relatively sufficient. Therefore, the oil flow is relatively smooth, the motion is also relatively smooth, and the noise is significantly lower than that of gear pumps.
I previously owned an old Mercedes-Benz C-Class, and the oil pump wiring harness went bad. I wanted to replace it myself, but it seemed quite challenging. The part is buried deep under the engine, requiring the removal of the underbody cover and the filter just to access the wiring connector. The engine layout in Mercedes is compact, and beginners can easily mess up the wiring or damage other sensors—I almost bent the temperature probe. My advice for beginners is not to take the risk and instead go straight to a professional shop for diagnosis and repair. They have specialized tools and wiring diagrams, and they can also check if the oil pump itself is faulty, saving you from unnecessary effort. In short, DIY attempts carry significant risks—if not done properly, you might end up causing more trouble and compromising driving safety.
