Water in Fuel Light WIF warning is on. - Sprinter-Forum Feb 25, 2016Water in Fuel Light WIF warning is on. Sprinter Talk Sprinter-Forum > General Forums Once you get the WIF alarm it is likely that the fuel filter water separation ability has been compromised or even overwhelmed. Changing the filter will at least get you back to OEM standard. Mercedes Benz has provided a Water In Fuel WIF monitor systemFuel Filter Change [Archive]Feb 26, 2019Fuel filter sensor - Sprinter-ForumJul 29, 2009See more results Water In Fuel WIF Sensor (OM642) - 0001539513 - FWSS104 Water in fuel sensor for the -01 style fuel filter used on Mercedes and Sprinter models equipped with the OM642 engine. This sensor is held into the fuel filter with two screws and must be removed and transferred to the new fuel filter during a filter replacement.
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