Mack DOC : OEM 21850643
MACK DOC : OEM 21850643
ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY
WARRANTY
1M MILES OR 1 YEAR
PRODUCT DESCRIPTION
This is a New, DOC, part number 114-0022-1 ( OEM Part Number 21850643 ). This part is primarily made for a Mack , and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here
OEM NUMBERS
| Primary OEM | 21850643 |
| Additional OEM | 20863840, 21850643, 85000777, 85001356, A042N736, Q621413 |
ADDITIONAL DETAILS
| CONDITION | New |
| UPC / Barcode | 00840490539402 |
| WEIGHT | 44.00 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.
The Mack DOC: OEM 21850643 delivers accurate fit and dependable function for compatible Mack diesel engines. Built to OEM specifications, this diesel oxidation catalyst reduces harmful emissions while supporting consistent exhaust system performance. Its durable construction provides long-lasting service in demanding conditions, protecting overall engine efficiency and maintaining compliance with emissions standards. Choosing an OEM DOC helps eliminate compatibility concerns and ensures reliable performance over time. This component is a trusted solution for keeping Mack-powered trucks and equipment operating smoothly and efficiently.
PEOPLE ALSO ASKS | BLOG(S)
The Mack Diesel Oxidation Catalyst (DOC), part number 21850643, plays a vital role in your vehicle’s emissions system. Installed in trucks equipped with Mack MP7, MP8, or MP10 engines, this DOC is the first component in the exhaust aftertreatment chain, responsible for reducing harmful gases as they exit the engine.
Its job begins as soon as the exhaust leaves the combustion chamber. The DOC contains a catalyst-coated honeycomb structure where key chemical reactions occur.
In Your Vehicle, the 21850643 DOC:
- Converts carbon monoxide (CO) into carbon dioxide (CO₂)
- Breaks down unburned hydrocarbons (THC) into water vapor
- Converts nitric oxide (NO) into nitrogen dioxide (NO₂), which is crucial for DPF function
By producing NO₂, your DOC helps the Diesel Particulate Filter (DPF) clean itself through passive regeneration, allowing soot to burn off naturally during normal driving—without additional fuel use or heat cycles.
This results in cleaner emissions, less maintenance, and longer DPF life. In short, the 21850643 DOC ensures your truck runs cleaner, complies with emissions standards, and reduces long-term service interruptions.
The Diesel Oxidation Catalyst (DOC) is a vital emissions component that helps reduce harmful gases like carbon monoxide and hydrocarbons. While it’s built for durability, its effectiveness can degrade over time due to exposure to heat, soot, and contaminants.
A typical DOC can last 100,000 to 200,000 miles, depending on a variety of factors. In fleet or commercial vehicles, this range may vary widely based on load conditions and idle time.
Several elements can shorten or extend the lifespan of your DOC:
- Fuel quality
- Dirty or contaminated fuel can damage the catalyst coating.
- Oil consumption
- Excess oil entering the exhaust can clog the DOC surface.
- Driving habits
- Short trips or low-speed driving may not allow the DOC to reach ideal operating temperature.
- Upstream component failures
- Malfunctioning injectors or turbo seals can lead to contamination.
- Maintenance history
- Infrequent service can allow soot and ash to accumulate.
Monitoring emissions performance, addressing engine issues early, and following a regular service schedule are the best ways to preserve DOC function over time.
Symptoms may include check engine lights, increased smoke, or reduced exhaust efficiency.
Yes, it is built for durability under heavy-duty truck operating conditions.
A clogged DOC can restrict exhaust flow and increase backpressure on the engine.
Yes, when it fails it can trigger diagnostic fault codes and dashboard alerts.
Mack DOCs
Product OEM 21850643