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CAT / Perkins DEF Head Unit : OEM ASP-918-1795-11

CAT / PERKINS DEF HEAD UNIT : OEM ASP-918-1795-11

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$895.00

CORE CHARGE:

$250.00
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 NUMBERASP-918-1795-11
PART TYPEDEF Head Unit
BRANDDuraWRX
ENGINE MAKECAT / Perkins
ENGINE TYPE
YEAR
PART NUMBERASP-918-1795-11
APPLICATION NOTESElectrical Connector: Deutsch DT4 Sensor Type: Digital (canbus) DEF Header Height (IN): 11
ADDITIONAL NOTESDEF Header, Helical Heater, 40 MICRON, 11"

PRODUCT DESCRIPTION

This is a New, DuraWRX DEF Head Unit, DuraWRX part number ASP-918-1795-11 ( OEM Part Number ASP-918-1795-11 ). This part is primarily made for a CAT / Perkins , and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

Additional Notes: DEF Header, Helical Heater, 40 MICRON, 11"

OEM NUMBERS

Primary OEMASP-918-1795-11
Additional OEM5356922, 5913427, ASP-918-1795-11, T432585, T434814

ADDITIONAL DETAILS

CONDITIONNew
UPC / Barcode
WEIGHT3.00 LBS

SHIPPING OPTIONS

Ship Weight : 3.00 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.


The CAT / Perkins DEF Head Unit OEM ASP-918-1795-11 delivers dependable DEF level monitoring and seamless communication with your emissions control system. Built to OEM specifications, it ensures accurate data transmission to support SCR performance and emissions compliance. Its rugged construction handles demanding conditions with ease, making it a trusted solution for restoring full DEF functionality. A smart replacement that helps reduce downtime and keeps your CAT or Perkins equipment running without disruption.

PEOPLE ALSO ASKS | BLOG(S)

The DEF (Diesel Exhaust Fluid) Head Unit is a crucial part of any Selective Catalytic Reduction (SCR) system, helping control nitrogen oxide emissions in diesel-powered equipment. The CAT / Perkins DEF Head Unit — OEM ASP-918-1795-11 — is specifically designed for accurate DEF level detection and temperature monitoring, ensuring emissions compliance and system reliability.

Key Functions of the OEM ASP-918-1795-11 DEF Head Unit:

  • Monitors DEF Fluid Levels
    Provides real-time feedback to the engine control module, helping prevent low fluid conditions.

  • Regulates Fluid Temperature
    Ensures DEF remains within the proper temperature range for optimal injection into the exhaust stream.

  • Supports Emissions Control
    Works within the SCR system to reduce NOx emissions in compliance with EPA standards.

  • Triggers Warning Indicators
    Sends signals when DEF is low, too cold, or compromised, helping avoid engine derate situations.

  • Prevents Costly Downtime
    A functional DEF head unit helps maintain consistent engine operation and reduces the risk of fault codes.

If your DEF system is showing warning lights or isn’t reading fluid levels correctly, the CAT / Perkins DEF Head Unit OEM ASP-918-1795-11 may be the solution. At Tamerx Diesel Parts, we offer quality DEF components that support emissions reliability and operational efficiency. Replacing a failing DEF head unit helps keep your engine compliant and running smoothly.

The DEF (Diesel Exhaust Fluid) head unit is an essential part of your diesel vehicle’s emissions system. It manages the flow of DEF to the SCR (Selective Catalytic Reduction) system, helping reduce harmful NOx emissions. When the DEF head unit starts to fail, it can trigger a range of problems that impact engine performance, fuel efficiency, and compliance with emissions regulations.

  • DEF Warning Light or Check Engine Light – A malfunctioning head unit can trigger dashboard alerts or diagnostic trouble codes.

  • Inaccurate DEF Level Readings – If the system displays empty or inconsistent DEF levels despite recent filling, the head unit could be at fault.

  • Engine Derate Mode – In severe cases, the engine may limit power output to protect the emissions system when DEF delivery is disrupted.

  • Crystallized DEF Around Fittings – White residue near the DEF tank or fittings may indicate leaks or poor dosing due to a faulty head unit.

  • Unusual Noises – A weak or failing DEF pump within the head unit may make clicking, buzzing, or inconsistent humming sounds.

  • Failed Regeneration Cycles – Improper DEF dosing can interrupt or delay DPF regeneration, leading to increased soot buildup.

  • Inability to Start After Shutdown – Some systems may lock out engine restarts if DEF injection issues are detected and not resolved.

Spotting early symptoms of a failing DEF head unit can help you avoid serious drivability issues and costly repairs. If you experience warning lights, strange noises, or inconsistent DEF readings, it’s best to have the system inspected promptly. Timely attention can keep your diesel engine running clean and efficiently.

Contaminated DEF fluid, electrical issues, or extreme environmental conditions can damage the unit’s components.

It is designed to last several years under normal use with clean DEF and proper maintenance.

Yes, exposure to freezing or high heat can affect sensor accuracy and internal performance.

It tracks DEF fluid level, temperature, and quality to ensure optimal operation of the emissions system.

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