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Dorman 904-378 Diesel Exhaust Fluid (DEF) Heater
| Brand | Dorman 904-378 |
|---|---|
| Electrical Connector Gender | Male Female |
| Electrical Connector Quantity | 2 |
| Electrical Connector Terminal Gender | Male Female |
| Electrical Connector Terminal Quantity | 3 |
| Electrical Connector Terminal Quantity | 4 |
| Height | 150 mm |
| Hose Included | No |
| Housing Color | Black |
| Housing Material | Plastic |
| Inlet Fitting Type | Female |
| Inside Diameter | 115 |
| Level Sensor Type | Resistor |
| Mounting Hardware Included | Yes |
| Outlet Fitting Type | Female |
| Package Contents | 1 Diesel Exhaust Fluid (DEF) Heater |
| Universal Or Specific Fit | Specific |
| Wire Color | Black; White; Yellow; Blue; Red; Gray |
| Wire Insulation Material | Plastic |
| Fits | Volkswagen · 4 vehicles |
OE FIX solution. Modifies the original design to address a common failure point and improve reliability.
Specific fit. Made for a direct, application-specific replacement.
Mounting hardware included. Ready for installation with the necessary hardware.
Cross-references URO 561198970A for the same application. See all 1.
DEF Heater for Volkswagen Passat
The Dorman 904-378 Diesel Exhaust Fluid (DEF) Heater is a specific-fit replacement for select Volkswagen Passat models. It addresses a common failure point in the factory DEF heater design by changing the original layout to better resist fluid intrusion and improve long-term reliability.
- Specific-fit DEF heater for select Volkswagen Passat applications
- OE FIX design modifies the factory-style layout to address intrusion-related failure points
- Plastic housing with black finish
- Female inlet and outlet fittings
- Electrical connector configuration includes 2 connectors with male/female terminals
- Mounting hardware included
- Level sensor type: resistor
Product Details
Built for emission control service, this Dorman DEF heater is engineered for 2012-2014 Volkswagen Passat and 2015 Volkswagen Passat models built to 6/29/14. The 904-378 is a direct replacement for the original heater assembly on the listed applications, with a revised design intended to reduce the risk of repeat failure caused by fluid intrusion. It cross-references URO 561198970A for the same application.
Common Issues It May Address
- DEF heater failure caused by fluid intrusion
- Warning lights related to the diesel exhaust fluid system
- Improper DEF temperature control in the tank assembly
- Emission system faults on Volkswagen Passat diesel applications
- Repeat replacement of the original heater unit
Installation Notes
Verify connector style, inlet and outlet fitment, and vehicle build date before installation. This part uses a specific fit and is intended for the listed Volkswagen Passat applications only. Inspect the DEF tank and related electrical connections for contamination or damage before installing the new heater assembly.
Quality Assurance
Dorman OE FIX components are designed to improve on known failure points in original equipment designs while maintaining application-specific fitment. Part number 904-378 is built for the listed Volkswagen Passat diesel emission control applications.
| Year | Make | Model | Liters | Cylinders | Fuel Type | Position | Notes |
|---|---|---|---|---|---|---|---|
| 2015 | Volkswagen | Passat | 2.0L | L4 | DIESEL | N/A | To 6/29/14 |
| 2014 | Volkswagen | Passat | 2.0L | L4 | DIESEL | N/A | — |
| 2013 | Volkswagen | Passat | 2.0L | L4 | DIESEL | N/A | — |
| 2012 | Volkswagen | Passat | 2.0L | L4 | DIESEL | N/A | — |
| No rows match your filter. | |||||||