04-30774-004 Genuine Freightliner DD5, DD8 DEF Header Quality Sensor

Freightliner DD5 DD8 DEF Level Sensor — What It Does The DEF level sensor on the Freightliner DD5 and DD8 tells the truck how much exhaust fluid it actually has — and because DEF is an emissions-mandated consumable, this reading carries legal weight: the inducement system’s warnings and derates are scheduled off what this sensor reports. Common Symptoms of a Failing DEF Level Sensor Level readings frozen, erratic, or contradicting the tank’s contents Low-DEF warnings with a full tank — or worse, none with an empty one Inducement derates driven by a reading, not a reality Crystallization binding the sensing…