CAT / PERKINS DEF HEAD UNIT : OEM ASP-918-1731-13
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-918-1731-13 ( OEM Part Number ASP-918-1731-13 ). 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, 13"
OEM NUMBERS
| Primary OEM | ASP-918-1731-13 |
| Additional OEM | 462-3610, 5932338, 82196510, 82224131, 82249729, ASP-918-1731-13, T434814 |
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"
Built to meet the specific requirements of CAT and Perkins emissions systems, the OEM ASP-918-1731-13 DEF Head Unit ensures accurate sensing of diesel exhaust fluid level and temperature. Its direct-fit design allows for simple installation without modifications, making it suitable for both service replacements and preventative maintenance. This unit helps maintain reliable communication between the DEF tank and engine control systems, supporting consistent emissions regulation. It’s engineered to align with factory standards for dependable operation. OEM construction provides lasting compatibility in demanding equipment environments.
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The OEM ASP-918-1731-13 DEF head unit is a compact but complex assembly designed for use in Caterpillar and Perkins SCR-equipped diesel engines. It combines multiple critical components that work together to monitor, protect, and regulate Diesel Exhaust Fluid (DEF) within the tank.
Key Components Include:
- DEF Level Sensor
- Monitors the amount of DEF in the tank and transmits real-time data to the ECM (Engine Control Module) to prevent low-fluid faults.
- DEF Temperature Sensor
- Measures the temperature of the fluid, ensuring DEF stays within operational range—especially important for cold weather conditions.
- Heating Element (if equipped)
- Prevents DEF from freezing by gently warming the fluid, allowing reliable startup and flow in low temperatures.
- DEF Suction Tube / Pickup Point
- Draws DEF from the tank and channels it toward the dosing system.
- Return Port / Vent
- Manages any returned fluid from the system and ensures proper tank pressure balance.
- Electrical Connector / Harness Port
- OEM-specific plug that connects to the vehicle’s wiring harness, enabling communication between the sensors and the ECM.
- Top Mounting Flange
- Designed for direct installation into compatible DEF tanks used on CAT and Perkins equipment.
These components work together to ensure the DEF system maintains accurate monitoring, fluid delivery, and compliance with emissions regulations. Always verify the OEM number (ASP-918-1731-13) when sourcing replacements.
If your DEF (Diesel Exhaust Fluid) head unit has failed, it’s important to act quickly to avoid reduced engine function or a no-start condition. The DEF head unit monitors fluid level, temperature, and quality—critical data for your emissions system to operate properly.
Immediate Steps to Take:
- Check for Warning Messages and Lights
- Look for:
- “Service DEF System”
- “No Start in XXX Miles”
- DEF or check engine lights
- Look for:
- Scan for Diagnostic Trouble Codes (DTCs)
- Use an OBD-II or dealer-level scan tool to read codes such as:
- P203F – Reductant Level Low
- P204C – Reductant Temperature Sensor Performance
- P206A – Reductant Quality Sensor Circuit
- Use an OBD-II or dealer-level scan tool to read codes such as:
- Visually Inspect the DEF System
- Check the DEF tank for contamination or low fluid.
- Inspect wiring harnesses and connectors for corrosion or damage.
- Look for crystallization or physical cracks around the head unit.
- Verify DEF Fluid Quality and Level
- Ensure the DEF fluid is ISO 22241 compliant and filled to proper levels.
- Replace the DEF Head Unit
- If the unit is confirmed faulty, it must be replaced. This typically involves draining the tank and removing the sensor assembly.
After replacement, clear all codes and perform a system reset with a scan tool. Driving cycles may be required before all monitors are ready. Prompt service helps prevent derate mode or a no-start lockout.
Yes, failure in the heater or sensors can trigger DEF system faults and result in engine warnings or derate.
Signs include inaccurate DEF level readings, DEF temperature faults, or frozen fluid due to heater failure.
Installation usually takes 30–60 minutes, depending on tank location and accessibility.
Yes, it’s designed for rugged conditions including cold climates, thanks to its integrated DEF heater and sealed construction.
