2011-16 Ford Exhaust Fluid Reservoir Heater Dorman 904-372 - 1AEMX00338

Warranty & Shipping
How-To & Tools
Product Reviews
Vehicle Fit


  • Brand new exhaust fluid heater
  • Also called "reductant heater"
  • Direct replacement
  • Built to strict quality control standards

Item Condition: New

Attention California Customers:

WARNING:  This product can expose you to chemicals including Nickel (Metallic), which is known to the State of California to cause cancer. For more information, go to

Lifetime Warranty

This item is backed by a Limited Lifetime Warranty. In the event this item should fail due to manufacturing defects during intended use, we will exchange the part free of charge (excludes shipping charges) for the original purchaser.

  1. step : Removing the Skid Plate (0:52)
    • Remove the 13mm bolt at the front part of the skid plate on the drive side of the driveshaft
    • Remove the two 13mm bolts on the back strap
    • Remove the five 13mm fasteners on the frame rail side
    • Lower the skid plate down and out
  2. step : Loosening the Filler Neck (2:25)
    • Open the fuel door
    • Remove the three 5.5mm screws
    • Remove the cap on the DEF filler neck
    • Pull the filler neck down and out
    • Replace the cap
  3. step : Removing the DEF Tank (3:04)
    • Disconnect the grayish-white connector on top of the tank
    • Pop the other end of the connector out of its bracket
    • Pry out the two DEF injector hose retainers
    • Remove the 13mm bolt on the DEF tank bracket
    • Remove the 13mm bolt on the backside of the DEF tank
    • Slowly lower the DEF tank out of the vehicle
    • Send the filler neck over the frame
    • Disconnect the injector line connector
    • Compress the pins on the injector and wiggle the line off
    • Slide the DEF tank out
  4. step : Removing the Heater Module (6:11)
    • Disconnect all the electrical connectors on the sending unit
    • Remove the three 4mm Allen bolts securing the module to the top of the tank
    • Remove the module
    • Unscrew the lock ring
    • Peel the rubber gasket out
    • Press down on the center piece and rotate it counterclockwise
    • Once it clicks, lift the sending unit up and out
    • Clip the wire ties
  5. step : Installing the Heater Module (8:50)
    • Drop the heater module into the tank
    • Slide the new gasket into the tank
    • Tighten the ring
    • Lock the connector onto its tab
    • Reinstall the module
    • Tighten the three 4mm Allen bolts
    • Connect the wiring harnesses
  6. step : Installing the DEF Tank (10:15)
    • Slide the DEF tank underneath the frame
    • Send the filler neck and lines over the frame
    • Reconnect the injector nozzle
    • Connect the injector connector harness
    • Lift the DEF tank up
    • Tighten the four 13mm bolts to the tank
    • Reconnect the main electrical connector
  7. step : Installing the Filler Neck (11:08)
    • Remove the DEF cap
    • Reinstall the filler neck into the fuel door
    • Reinstall the three 5.5mm screws
    • Reinstall the collar over the threads
    • Reinstall the DEF cap
  8. step : Reinstalling the Skid Plate (11:34)
    • Lift the skid plate up into place
    • Set some nuts in to keep the plate level
    • Tighten the 13mm hardware

Tools needed for replacement:

    General Tools

  • Pick
  • Flashlight

  • Materials, Fluids, and Supplies

  • Gloves
  • Safety Glasses

  • Ratchets & Related

  • Ratchet
  • Socket Extensions

  • Sockets - Metric

  • 5.5mm Socket
  • 15mm Socket
  • 13mm Socket

4.50/ 5.0
4 reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Reductant heater for DEF
So far so good. The part fit perfect and I cleared the code with the computer. I ran the truck for a couple hundred miles and the check engine light hasnt came back one. Pulling the tank for the first time was a little bit of a pain. Everything that I purchase from 1aauto works perfect.
September 5, 2017
It was easy to find what i was needing on this website, everything went smooth. I only wish they would carry all parts containing to what i needed but overall i will try 1a auto again if i ever need something.
November 7, 2017
Working well
Only installed for a few weeks but working like it is supposed to. Not to bad to install and much cheaper than having it done at a dealer.
November 13, 2017
Exact replacement, fast shipping
Just completed the repair on my 2011F350 and I have to say the ordering process was easy, shipping was fast and the part was an exact replacement. Took me a couple of hours from start to finish, my only suggestion is to make sure you clean off the top of your DEF thank before you disassemble everything. I did drain my DEF fluid when I took the old unit out and refilled it with fresh DEF after I reinstalled the tank.
December 2, 2017
Will this fit my car? Add a vehicle to make sure
Customer Q&A
Ask a question to 1A Auto customers who purchased the product
whats meant by limited warranty for 904-372-1aemx00338 ?
David M December 5, 2017
In the event of failure during intended use due to a manufacturer defect we would issue a replacement for as long as you own the vehicle.
Alex P December 5, 2017
Year Make Model Description
2011-2016Ford F250 Super Duty Truck Ford F250 Super Duty Truck Exhaust Fluid Reservoir Heater V8 6.7L Turbo Diesel Dorman 904-372
2011-2016Ford F350 Super Duty Truck Ford F350 Super Duty Truck Exhaust Fluid Reservoir Heater V8 6.7L Turbo Diesel Dorman 904-372
2011-2016Ford F450 Truck Ford F450 Truck Exhaust Fluid Reservoir Heater V8 6.7L Turbo Diesel Dorman 904-372
Part #: 1AEMX00338

Order must be placed by 4pm ET
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Estimated Arrival Cost

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Get it in: 2 - 4 Business Days

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Brand #: 904-372

How-to Video:

(12:20 min)