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Fitment of Mahle Water Level Sensors



Some fuel filters with a plastic housing are equipped with an interface for fitting a water level sensor, which is not installed on all vehicles that come with MAHLE KL418, 431 and 581 products as original equipment. When the filter is new, the threaded mounting hole has a visible, thin dividing wall at the end and appears closed.


Media Library - Threaded Mounting Hole


A number of enquiries received by MAHLE Aftermarket indicate that the fitting of these filters, and in particular the water level sensors, always causes uncertainty and raises questions. When screwing the sensor into place, considerable resistance can be felt as the sensor head penetrates the dividing wall in the fuel filter at a predetermined breaking point. This causes a cracking noise.

The company’s technical guidance is designed to reassure independent workshops when replacing the OE filter that the noise and the resistance felt are not indicative of a fault. Neither the sensor nor the filter is damaged during the installation process. The dividing wall that has broken off does not pass through the filter element. It remains on the filter’s dirty side, ensuring that all components maintain their full functionality.


Media Library - Water Sensor Inserted


These filters are supplied as OE to a host of volume cars, including Citroën C2, C3, Berlingo, Xsara Picasso, C5, C6 and C8 models powered by 1.4, 1.6 and 2.2HDi engines, Ford Fiesta, Focus, Mondeo and S-MAX TDCi models, Jaguar XF 2.2D, Mazda 3, Mitsubishi Outlander 2.2DI-D and Peugeot models sharing the same diesel engine options.


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