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Cummins ISX DOC : OEM 4329542RX

CUMMINS ISX DOC : OEM 4329542RX

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$2,150.00

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 NUMBER 4329542RX
PART TYPE DOC
BRAND
ENGINE MAKE Cummins
ENGINE TYPE ISX
YEAR
PART NUMBER 102-0072

PRODUCT DESCRIPTION

This is a New, DOC, part number 102-0072 ( OEM Part Number 4329542RX ). This part is primarily made for a Cummins ISX, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

OEM NUMBERS

Primary OEM4329542RX
Additional OEM1912726, 1912726PE, 1912726PEX, 1949999, 1949999PE, 1949999PEX, 1978265PE, 1978265PEX, 4329542, 2070750056, 4329542NX, 4329542RX, 4353284, 4353284NX, 4353284RX, 5287100, 5287100NX, 5287100RX, 5298350, 5298350NX, 5298350RX, A029L380, A035E400, A041P419, A045X391, A047V484, A047V565, PN: 4353284, PN: A047V484

ADDITIONAL DETAILS

CONDITIONNew
UPC / Barcode00840490539006
WEIGHT44.00 LBS

SHIPPING OPTIONS

Ship Weight : 44.00 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.


Engineered for lasting reliability, the Cummins ISX DOC: OEM 4329542RX delivers precise fit and steady function for compatible ISX diesel engines. Manufactured to OEM standards, this diesel oxidation catalyst is built to reduce harmful emissions while supporting dependable exhaust system performance. Its durable design provides consistent service in demanding conditions, protecting overall engine efficiency and ensuring compliance with emissions requirements. Choosing an OEM DOC helps prevent compatibility concerns and promotes long-term dependability. This component is a reliable choice for keeping Cummins-powered trucks and equipment operating smoothly and effectively.

PEOPLE ALSO ASKS | BLOG(S)

The Cummins Diesel Oxidation Catalyst (DOC), part number 4329542RX, is a foundational emissions control device designed specifically for Cummins ISX (15‑liter) engines. As the first stage in the aftertreatment system, it plays a critical role in cleaning exhaust gases as they exit the engine.

How It Works

  • Oxidation of Harmful Components
    • When exhaust gases pass through the DOC, chemical reactions on its coated substrate convert dangerous pollutants—like carbon monoxide (CO) and unburned hydrocarbons (THC)—into less harmful byproducts such as carbon dioxide and water vapor.
  • Conversion of NO to NO₂
    • The DOC also transforms nitric oxide (NO) into nitrogen dioxide (NO₂). This transformation is vital for promoting passive regeneration of the Diesel Particulate Filter (DPF). The generated NO₂ helps burn off soot trapped in the DPF at normal operating temperatures, without requiring additional heat or fuel-intensive cycles.

Why It Matters

Placing a DOC at the front of the exhaust aftertreatment system ensures harmful emissions are reduced early. By fostering smoother and more efficient passive regeneration in the DPF, the DOC helps:

  • Maintain reliable, long-term performance
  • Minimize maintenance needs and regeneration interruptions
  • Support emissions compliance with EPA standards

The OEM 4329542RX DOC provides a direct-fit, durable solution engineered to uphold the performance expected in heavy-duty ISX applications.

The Diesel Oxidation Catalyst (DOC) plays an important role in controlling emissions by converting harmful gases into less harmful substances. Over time, the DOC can accumulate ash and soot, which reduces its ability to function properly. To keep your emissions system working efficiently, it’s important to know the recommended service intervals.

Typical DOC Service Interval

For most diesel vehicles, the DOC should be inspected and cleaned between 100,000 and 200,000 miles, depending on usage and operating conditions. Heavy-duty applications, such as vocational trucks or off-road equipment, may require more frequent checks.

Key Factors That Affect Service Frequency

  • Engine load – High-demand driving may increase buildup.
  • Fuel type – Cleaner fuel helps minimize deposits.
  • Oil consumption – Excessive oil can clog the DOC more quickly.
  • Driving conditions – Urban or low-speed routes can prevent proper self-cleaning.

Why Timely DOC Service Matters

Servicing the DOC on schedule helps maintain proper exhaust flow and prevents downstream issues with the DPF and SCR system. A blocked DOC can lead to higher exhaust temperatures and reduced efficiency.

Check your vehicle’s maintenance manual for manufacturer-specific intervals, and always monitor for dashboard alerts or fault codes.

Ignoring it can cause engine warning lights, excess smoke, and failed emissions tests.

It ensures proper emissions control with OEM-quality design and fit.

No, it is a replacement component that functions without routine servicing.

It is built to withstand heavy-duty diesel conditions for long service life.

Cummins DOCs

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