CAT / PERKINS DEF HEAD UNIT : OEM ASP-918-1731-11
ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY
WARRANTY
1M MILES OR 1 YEAR
PRODUCT DESCRIPTION
This is a Remanufactured, DuraWRX DEF Head Unit, DuraWRX part number ASP-918-1731-11 ( OEM Part Number ASP-918-1731-11 ). 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, Coaxial Heater, 40 MICRON, 11"
OEM NUMBERS
| Primary OEM | ASP-918-1731-11 |
| Additional OEM | 4549427, 462-3219, 4623219, 5932337, 82196511, 82217518, 82224129, 82249726, ASP-918-1731-11, T400735, T434824 |
ADDITIONAL DETAILS
| CONDITION | New |
| UPC / Barcode | |
| WEIGHT | 3.00 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.
"This Product Doesn't Have a Core"
The OEM ASP-918-1731-11 DEF Head Unit is designed for use in CAT and Perkins diesel systems, offering accurate monitoring of DEF fluid level and temperature. Built to original equipment standards, this unit installs directly into the DEF tank and integrates seamlessly with system controls. It supports reliable communication with the emissions control module, helping maintain proper operation and system compliance. Whether you're addressing a sensor fault or conducting preventative maintenance, this component provides a dependable solution. OEM construction ensures long-term fit and function within demanding environments.
PEOPLE ALSO ASKS | BLOG(S)
The OEM ASP-918-1731-11 DEF head unit is a critical component used in Caterpillar (CAT) and Perkins diesel engines equipped with Selective Catalytic Reduction (SCR) systems. This unit is mounted on top of the DEF (Diesel Exhaust Fluid) tank and plays several essential roles in managing the emissions control process.
Here's how it works:
- DEF Level Monitoring
- The head unit includes a sensor that continuously measures the fluid level in the DEF tank. This data is sent to the engine control module (ECM) to ensure sufficient DEF is available for proper dosing.
- Temperature Sensing
- An integrated temperature sensor monitors the DEF’s condition, detecting if the fluid is within optimal operating range or at risk of freezing.
- Heater Activation (if equipped)
- In cold environments, a built-in heater warms the DEF to keep it from freezing, allowing normal system function during cold starts.
- Fluid Supply Management
- The unit controls the delivery of DEF from the tank to the dosing module, where it’s injected into the exhaust stream to reduce NOx emissions.
- Communication Interface
- It connects directly to CAT or Perkins ECM systems, transmitting real-time DEF data for accurate diagnostics and system control.
Always confirm compatibility using OEM part number ASP-918-1731-11 before installation.
No, you cannot reliably drive a modern diesel vehicle without a functioning DEF (Diesel Exhaust Fluid) head unit. The DEF head unit is essential to the emissions system, and when it's missing or fails completely, the vehicle's control module cannot verify DEF level, temperature, or quality.
What Happens If You Drive Without It:
- Check Engine Light and DEF Warnings
- You'll likely see warnings such as “Service DEF System” or “No Start in XXX Miles.”
- Derate Mode (Reduced Speed Limit)
- Many diesel vehicles will enter a restricted mode that limits speed to around 5 mph if the DEF system isn't functioning correctly.
- Eventual No-Start Condition
- After continued driving without DEF system data, the ECU may initiate a no-start lockout until the issue is resolved.
Why It’s Required:
- The DEF head unit ensures compliance with EPA emissions regulations.
- It confirms that the SCR (Selective Catalytic Reduction) system can reduce NOx emissions properly.
- Bypassing or deleting the system is illegal in most regions and can result in fines.
If your DEF head unit fails, it's important to replace it promptly. Driving without it isn't just risky—it can leave you stranded and potentially in violation of emissions laws.
It features an internal suction tube, DEF level sensor, DEF temperature sensor, and a built-in heating element.
Yes, malfunctioning sensors or heater failure can trigger DEF system faults that may result in reduced engine power.
No calibration is needed, but you should clear fault codes and verify sensor readings using diagnostic tools.
Yes, it includes a heating element to prevent DEF freezing during cold starts and operation in low temperatures.
