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John Deere Hydrocarbon Doser Unit 2014-2020: OEM RE548546

JOHN DEERE HYDROCARBON DOSER UNIT 2014-2020: OEM RE548546

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$389.00

CORE CHARGE:

$50.00
iCORE DISCLAIMER: The CORE charge is a 30 day hold and will not be processed as long as the CORE is returned within 30 days. If you do not have a CORE or fail to return the CORE within 30 days, the CORE charge hold amount will be processed at that time.

AVAILABILITY IN STOCK
OEM NUMBER RE548546
PART TYPE Hydrocarbon Doser Unit
BRAND Tamerx Diesel Products
ENGINE MAKE John Deere
ENGINE TYPE
YEAR 2014-2020
PART NUMBER RE548546RM

PRODUCT DESCRIPTION

This is a Remanufactured Tamerx Hydrocarbon Doser Unit, Tamerx part number RE548546RM ( OEM Part Number RE548546 ). All parts are proudly remanufactured in the U.S.A. to the highest of OEM standards, and improvements are often applied to the original design in the remanufacturing process. This part is primarily made for a John Deere , production years 2014-2020, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

OEM NUMBERS

Primary OEMRE548546
Additional OEMRE548546

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490539556
WEIGHT2.00 LBS

SHIPPING OPTIONS

Ship Weight : 2.00 LBS
UPS Ground, 2nd Day Air, Next Day Air

SHIPPING POLICY

Tamerx Diesel Products ships via UPS Ground. Next day air shipping can be arranged for a reasonable price of anywhere from $50.00 - $100.00 depending on the weight of the product and your location. We will do everything we can to make sure that you get the service you need. We understand how important it is to receive your order as quickly as possible.
In most cases Tamerx Diesel Products only needs one address, as long as your product is shipping to the same location as your billing information. In order to eliminate credit card fraud, your billing information must match the credit card you provide.

The terms, conditions, and details of our warranty vary from product to product. Specific warranty details can be found below.

Tamerx Diesel Products provides a replacement warranty on all of our parts. The duration and mileage limitations of the warranty vary by product and are specified on the product's detail page/item listing.

Please note that the warranty covers replacement of the part and the cost of shipping the replacement part to you only. It does not cover any shop, labor, towing, or any similar or related costs. This is not a "money back guarantee".

If you experience a problem with your part or it is not functioning properly, the correct warranty procedure is to call us at (510) 257-1777 (8:00 AM - 5:00 PM ET Monday through Friday). Be sure to have your order number and/or other relevant order information ready so we can easily locate your order and resolve your issue as quickly as possible. From that point, we will review with you any troubleshooting steps that may need to be taken and other areas or systems that can be checked to rule out external problems contributing to your part's issue. If a replacement is determined to be necessary, we will then arrange for your replacement part to ship out ASAP and issue any necessary return shipping labels and/or documents.

As is the case for the majority of the diesel products sold on Tamerx Diesel Products, your part's warranty is active as soon as you install it. In some other cases, warranty activation is contingent upon you sending us your core (i.e., your old part). Tamerx Diesel Products will provide you a return shipping label for parts that have a warranty with a core return condition. When we have received your core return, the part's warranty coverage begins. We reserve the right to void the product warranty if your core is not received within the allotted time, or if it isn't received at all. If the warranty for the diesel part you are purchasing has a core return requirement, it will be clearly noted on the product detail page/item listing.

What is a Core Charge?

A core charge (also called "core deposit") is similar to the deposit you might pay for a can or bottle of soda and is a standard requirement in the auto parts industry. For example, in many states, to promote recycling, you pay a deposit when you purchase a can of soda and receive your deposit back when you return the empty can. Many automotive parts have a core charge, or core price, that works in essentially the same way as a soda can deposit.

30 Day Core Charge Hold

You authorize Tamerx Diesel Products, to hold your credit card for the specified core charge amount and that you agree to return your core with 30 days of receiving the purchased part. When we have received your core return, the hold is released and the core charge payment is canceled.

The customer, or parts buyer, is responsible for any shipping costs associated with core returns unless otherwise specified in the product listing/detail page. Tamerx Diesel Products offers prepaid UPS shipping labels (SKU numbers UPS-CR1 and UPS-CR2) for use in returning your core that are available for purchase on our website during your shopping/order process.

The shipping label you will need to use for the core return is dependent upon what part you are purchasing. UPS-CR1 is good for cores weighing up to 20 pounds. UPS-CR2 is appropriate for shipping cores weighing 21 pounds or more. You must include enough information with the core return that clearly identifies it as a.) a Core Return, and b.) contains enough information we can use to clearly associate the core return with your order. Including a copy of the invoice or packing slip that came with the original shipment, clearly marked "Core Return", is ideal. Alternately, you can include a note marked as "Core Return" that includes your order number, full name and address, and phone number or other contact information. Failure to include this information with your returned core will most likely delay any due core credit being issued and/or delay any applicable warranty activation. Core returns need to be for the exact part purchased and cannot be damaged. Substituting another part in place of the part you have purchased is not acceptable.

All fluids must be drained.

If you have purchased a set or a parts package, you will need to return cores for all components of the set. For example, if you have purchaed a high pressure oil pump with an IPR valve, you will need to return both HPOP and IPR valve cores to receive proper credit. If you have purchased an EGR cooler/EGR valve package, your core return must consist of an EGR cooler core and an EGR valve core, or core credit will not be given.

Core Charges are often mandated by state legislature, and, as such, the actual core charge and taxes on the charge may vary depending on the state in which you buy your part. The Tamerx Diesel Products core charge presented to you online today with your item is representative of the most common core charge.


Precise dosing meets rugged reliability with the John Deere Hydrocarbon Doser Unit — OEM RE548546 (2014-2020). Designed to perform at OEM levels, this component meters hydrocarbons into the aftertreatment system with exceptional accuracy, helping the regeneration process run smoothly and emissions stay in compliance. Built with quality materials for heavy-duty performance, it installs easily and delivers steady, long-term function under the toughest conditions—mile after mile.

FITMENT CHART

YEARMAKEENGINE(S)
2014John Deere
2015John Deere
2016John Deere
2017John Deere
2018John Deere
2019John Deere
2020John Deere

PEOPLE ALSO ASKS | BLOG(S)

If your John Deere engine has been dealing with erratic regenerations or inconsistent exhaust behavior, the issue could be rooted in the hydrocarbon doser unit. The OEM RE548546 is designed to inject hydrocarbons precisely into the exhaust stream—aid that is essential during regeneration events and to help keep emission control systems functioning properly.

  • Delivers accurate fuel dosing into your exhaust for regeneration, ensuring the proper chemical balance that helps exhaust aftertreatment components (like DPFs) burn off soot effectively.

  • Helps maintain stable exhaust temperatures required for clean regeneration cycles, reducing the risk of excessive soot buildup and forced regen events.

  • Protects downstream components from damage caused by incomplete combustion products, which can otherwise lead to sensor fouling or accelerated wear.

  • Provides reliable fit and operation since it adheres to John Deere OEM specifications—making replacement smoother with fewer compatibility concerns.

  • Offers assurance through warranty support and service standards that back the product’s integrity and performance in real-world use.

Choosing the OEM RE548546 Hydrocarbon Doser Unit means investing in proper regeneration, better exhaust cleanliness, and fewer surprises in maintenance. With this unit in place, your John Deere system can operate more predictably, cleanly, and efficiently.

The Hydrocarbon (HC) Doser Unit plays a critical role in diesel aftertreatment systems by injecting fuel into the exhaust stream to initiate regeneration of the Diesel Particulate Filter (DPF). When this component begins to fail, it can disrupt emissions control, fuel efficiency, and engine performance. Recognizing early symptoms is essential to avoid costly repairs and maintain compliance with emission standards.

Common Symptoms of a Failing HC Doser Unit

  • Increased Regeneration Frequency
    A faulty doser unit may cause incomplete or failed regenerations, prompting the DPF system to attempt regeneration more often than normal.

  • DPF Warning Light or Check Engine Light
    If the unit fails to inject fuel correctly, sensors may detect the issue and trigger the check engine light or DPF fault indicators.

  • Poor Fuel Economy
    Excessive or improper dosing may lead to higher fuel consumption without a corresponding increase in power output.

  • Black Smoke or Excessive Emissions
    A malfunctioning doser may result in poor combustion within the aftertreatment system, leading to visible exhaust smoke or elevated emissions.

  • Regeneration Failure Codes (DTCs)
    Diagnostic Trouble Codes related to failed regeneration or fuel dosing can appear, indicating doser malfunction or restricted flow.

  • Soot Buildup in Exhaust System
    A failed doser may prevent effective DPF regeneration, leading to soot accumulation in the DPF and surrounding exhaust components.

Failing to address HC doser unit issues can lead to reduced engine performance, failed emissions tests, and costly repairs involving the DPF and related systems. If you observe any of the symptoms listed above, it’s advisable to have your vehicle diagnosed promptly. Replacing or servicing the doser unit in time can help maintain system efficiency and engine longevity.

Continued malfunction may degrade the catalytic converter, damage sensors, and lead to costly exhaust system repairs.

Clicking, irregular operation, or no response on dosing commands may indicate internal mechanical or electrical faults.

Consistent aftertreatment regeneration behavior and matching sensor feedback indicate correct unit operation.

Ensuring exhaust cleanliness, avoiding excessive particulate buildup, and keeping the dosing channels clean help extend lifespan.

 

John Deere Hydrocarbon Doser Units

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