Caterpillar DEF Doser Injector 2018-2024: OEM 451-0188
CATERPILLAR DEF DOSER INJECTOR 2018-2024: OEM 451-0188
ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY
WARRANTY
1M MILES OR 1 YEAR
PRODUCT DESCRIPTION
This is a New, Tamerx DEF Doser Injector, Tamerx part number 451-0188TX ( OEM Part Number 451-0188 ).This part is primarily made for a Caterpillar , production years 2018-2024, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here
OEM NUMBERS
| Primary OEM | 451-0188 |
| Additional OEM | 451-0188, 4510188 |
ADDITIONAL DETAILS
| CONDITION | New |
| UPC / Barcode | 00840490539600 |
| WEIGHT | 2.00 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.
"This Product Doesn't Have a Core"
Engineered for precision, the Caterpillar DEF Doser Injector — OEM 451-0188 (2018-2024) regulates the exact amount of diesel exhaust fluid your aftertreatment system needs, ensuring optimal SCR performance and clean emissions. Built to Caterpillar’s strict OEM standards for rugged durability and dependable operation, it installs easily with drop-in fitment and contributes to smoother operation, reduced emissions, and long-term reliability—mile after mile.
FITMENT CHART
| YEAR | MAKE | ENGINE(S) | ||||
|---|---|---|---|---|---|---|
| 2018 | Caterpillar | |||||
| 2019 | Caterpillar | |||||
| 2020 | Caterpillar | |||||
| 2021 | Caterpillar | |||||
| 2022 | Caterpillar | |||||
| 2023 | Caterpillar | |||||
| 2024 | Caterpillar | |||||
PEOPLE ALSO ASKS | BLOG(S)
Maintaining your Caterpillar engine’s aftertreatment system depends a lot on how precisely the DEF (Diesel Exhaust Fluid) injector—or doser—functions. The OEM 451-0188 DEF Doser Injector for 2018-2024 models plays a central role in NOx reduction by delivering the right amount of DEF at the right time into the exhaust flow. If this part fails or operates poorly, you can face missed emissions targets, warning lights, or even engine derate.
-
Creates fine, atomized spray of DEF fluid into the exhaust before the SCR (Selective Catalytic Reduction) catalyst, ensuring good mixing and efficient NOx conversion.
-
Operates under precise temperature and pressure controls so that DEF only injects when the exhaust and SCR system are ready—this avoids wasted fluid and prevents damage from thermal stress.
-
Helps maintain clean SCR catalyst surfaces by preventing over-/under-delivery of DEF, which can otherwise lead to buildup, clogging, or inefficient reactions.
-
OEM fit ensures proper sealing, correct spray pattern, and reliable electrical connectivity—minimizing risks of leaks, misfires, or diagnostic faults.
-
Supported by Caterpillar-level quality and coverage, offering long service life and helping reduce downtime and repair costs.
Choosing the genuine OEM 451-0188 DEF Doser Injector means investing in reliable emissions performance, fewer aftertreatment issues, and operating smoothly within environmental standards. For Caterpillar users focused on durability and regulatory compliance, it’s a vital component—and one that Tamerx Diesel Parts makes available with assurance and authenticity
Diesel Exhaust Fluid (DEF) injectors are essential to the selective catalytic reduction (SCR) system, helping reduce harmful emissions in diesel engines. When they fail or clog, emissions can spike, warning lights may trigger, and vehicle performance may suffer. Understanding the common causes of DEF injector issues is crucial for preventative maintenance and reliable engine function.
Common Causes of DEF Injector Failure or Clogging
-
Contaminated DEF Fluid
Using DEF that contains impurities, such as dirt, debris, or non-urea-based substances, can clog the injector nozzle and lead to failure over time. -
Crystal Buildup
DEF crystallizes when exposed to air, especially around the injector tip. If the system doesn't purge correctly after shutdown, crystals can form and block the nozzle. -
Incorrect Fluid Handling
Storing DEF in unclean or incompatible containers may introduce contaminants. Poor handling practices often lead to clogged injectors or system damage. -
Faulty Heating Elements
DEF systems rely on heated lines and injectors to prevent freezing. If heating components fail, the injector may become damaged or clogged during cold weather. -
Electrical Issues
Problems with wiring, sensors, or connectors can prevent the injector from operating properly, sometimes leading to uneven spraying or no injection at all. -
Lack of Regular Maintenance
Skipping routine DEF system inspections can allow minor issues to worsen unnoticed. Crystallization and contamination can accumulate and block the injector.
DEF injector failure is often preventable through clean fluid practices, proper storage, and routine maintenance. Monitoring for signs like fault codes, reduced engine power, or poor DEF consumption can help catch problems early. Investing in quality DEF and scheduled servicing is key to keeping your emission system function
With clean DEF, regular system checks, and avoiding crystallization, it can perform reliably over many thousands of miles or hours.
Symptoms include check-engine or SCR warning lights, excessive DEF use, or incomplete regeneration cycles.
A failed doser leads to improper DEF delivery, which causes higher NOx emissions, potential engine derate, or system shutdown.
By performing a dosing quantity test, measuring DEF flow, or using diagnostics to monitor SCR effectiveness.
Caterpillar DEF Doser Injectors
