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Cummins X12, X15 DOC : OEM 5509700RX

CUMMINS X12, X15 DOC : OEM 5509700RX

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$2,995.00

CORE CHARGE:

$500.00
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 NUMBER5509700RX
PART TYPEDOC
BRANDSkyline Emissions
ENGINE MAKECummins
ENGINE TYPEX12, X15
YEAR
PART NUMBERXQ0462-M

PRODUCT DESCRIPTION

This is a New, Skyline Emissions DOC, Skyline Emissions part number XQ0462-M ( OEM Part Number 5509700RX ). This part is primarily made for a Cummins X12, X15, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

OEM NUMBERS

Primary OEM5509700RX
Additional OEM4394906, 4394906RX, 5509700, 5509700RX, A055R708

ADDITIONAL DETAILS

CONDITIONNew
UPC / Barcode00840490548435
WEIGHT51.60 LBS

SHIPPING OPTIONS

Ship Weight : 51.60 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.


Turn up your engine’s emission performance with the Cummins X12, X15 DOC (OEM 5509700RX), engineered to clean up exhaust gases right at the source. This Diesel Oxidation Catalyst fits X12 and X15 engines with precision, helping reduce harmful pollutants before they move through the aftertreatment system. Built to strict OEM standards, it delivers reliable durability and consistent performance under demanding conditions. Stay compliant and keep your truck running cleaner with a DOC that’s ready for the long haul.

PEOPLE ALSO ASKS | BLOG(S)

The Diesel Oxidation Catalyst (DOC) is a critical emissions component in the aftertreatment system of Cummins X12 and X15 engines. Positioned early in the exhaust stream, the DOC helps reduce harmful pollutants before they reach downstream components, supporting cleaner exhaust flow and proper emissions system operation. The Cummins X12, X15 DOC OEM 5509700RX is designed to meet factory requirements, making it a dependable replacement option when maintaining or restoring exhaust system functionality.

  • Reduces harmful exhaust gases by converting carbon monoxide and unburned hydrocarbons into
   less harmful compounds, supporting cleaner exhaust output and proper emissions control

  • Designed for Cummins X12 & X15 engines ensuring correct fitment, proper sealing, and seamless
   integration with the factory exhaust and aftertreatment system

  • Supports downstream emissions components by lowering pollutant load early in the exhaust flow,
   helping the DPF and SCR systems function as intended

  • OEM-grade construction (5509700RX) providing dependable durability, consistent operation, and
   compatibility with original emissions system hardware

  • Helps maintain emissions system stability by supporting balanced exhaust conditions and reducing
   the likelihood of emissions-related fault codes

Replacing a worn or restricted DOC with the Cummins X12, X15 DOC OEM 5509700RX from Tamerx Diesel Parts helps restore proper exhaust treatment and protect the integrity of the entire aftertreatment system. Choosing an OEM-matched DOC filter ensures reliable operation, supports emissions compliance, and helps keep your engine running smoothly under everyday driving conditions.

 

A Diesel Oxidation Catalyst (DOC) is designed to reduce harmful exhaust emissions and typically requires little direct maintenance. However, certain operating conditions and engine issues can cause a DOC to become contaminated, restricted, or fail over time. Understanding these causes helps prevent premature exhaust system problems.

  • Excessive oil consumption: Burning engine oil can leave ash deposits that contaminate the DOC.

  • Poor fuel quality: Contaminated or low-quality fuel can introduce deposits that coat the catalyst.

  • Incomplete combustion: Faulty injectors or engine misfires increase unburned hydrocarbons in the exhaust.

  • Low exhaust temperatures: Frequent short trips or extended idling prevent the DOC from operating efficiently.

  • Incorrect engine oil: High-ash or non-approved oil accelerates residue buildup.

  • Upstream engine or exhaust issues: Turbocharger, EGR, or sensor problems can overload the DOC with contaminants.

DOC failure or clogging is usually the result of underlying engine or maintenance issues rather than the component itself. Addressing problems early and maintaining proper engine operation helps protect the DOC and ensure reliable emissions performance.

By oxidizing pollutants early in the exhaust stream, it reduces the amount of toxic gases released into the atmosphere. This assists the engine in meeting environmental standards.

Symptoms of a failing DOC include higher exhaust temperatures, emissions warning lights, and reduced exhaust efficiency. These signs often indicate that the catalyst is no longer effectively treating exhaust gases.

You should consider a replacement if the DOC shows signs of internal damage, severe clogging, or repeated fault codes. Regular inspection during scheduled service helps catch issues early.

When installed correctly, the DOC should support normal engine operation while improving emissions control. It works with the rest of the exhaust system without reducing power.

Cummins DOCs

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