Warm the diesel exhaust fluid your emissions system relies on with the Dorman - OE Solutions Diesel Exhaust Fluid (DEF) Heater, part number 904-643, an OE FIX upgrade built with added protection against fluid intrusion. It fits many vehicles, among them the 2015-2019 Ford Transit-150, 2015-2019 Ford Transit-250 and 2015-2019 Ford Transit-350. See the "Vehicles it fits" section for the full list and engine details.
On certain vehicles, the factory DEF heater often fails when fluid works its way inside. Dorman's OE FIX solution revises the original design to target that weak point and is intended to improve reliability. If a failed heater is the cause of your DEF system trouble, this unit replaces it as a direct-fit replacement for the listed applications.
- Upgraded replacement: adds protection against fluid intrusion compared with the factory design.
- Built like the original: designed to fit and work like the original equipment part.
- Thoroughly tested: every design goes through cyclical fatigue testing of the heater element.
- Engineering support: backed by Dorman's team of engineers in the United States.
Signs a DEF heater may need replacing: DEF system warning messages or stored fault codes. Other DEF components can produce similar symptoms, so diagnose the cause before replacing.
Interchange: F01C600315 · F01C600342 · F01C600362 · CK4Z5L227B · CK4Z5L227D · CK4Z5L227E · CK4Z5L227F · EM1509URH
This part cross-references / interchanges with the following part numbers:
F01C600315, F01C600342, F01C600362, CK4Z5L227B, CK4Z5L227D, CK4Z5L227E, CK4Z5L227F, EM1509URH
Frequently Asked Questions
What does a Dorman DEF heater do?
It warms the diesel exhaust fluid so the emissions system can use it in cold conditions. The 904-643 adds protection against fluid intrusion, which often causes the factory heater on certain vehicles to fail.
How is the 904-643 different from the factory DEF heater?
It is a Dorman OE FIX design that modifies the original to add protection against fluid intrusion, which often causes the factory heater on certain vehicles to fail.
Which Ford Transit models does this DEF heater fit?
It fits the 2015-2019 Ford Transit-150, 2015-2019 Ford Transit-250 and 2015-2019 Ford Transit-350, among other listed applications. Check the "Vehicles it fits" section for your vehicle and engine.
What signs may point to a failing DEF heater?
DEF system warning messages or stored fault codes may indicate heater trouble. Other DEF components can cause similar symptoms, so diagnose the cause before replacing.
How is this DEF heater tested?
Each Dorman design goes through cyclical fatigue testing of the heater element, and it is backed by Dorman's team of engineers in the United States.
