Reliable Exhaust Treatment: Cummins X12 / X15 DOC (2018–2022)
What is it?
The Cummins X12 / X15 DOC (Diesel Oxidation Catalyst) for model years 2018–2022 helps transform harmful carbon monoxide (CO) and unburned hydrocarbons (HC) from exhaust into less harmful gases before they reach the DPF or SCR systems downstream.
Why choose this DOC?
Specifically engineered for X12 and X15 engines in that period, this DOC offers dependable conversion power without producing excessive backpressure. Installing the matched DOC helps protect downstream emission components, reduces system stress, and supports smooth, long-term operation.
Key Benefits
✅ Designed for Cummins X12 & X15 engines (2018–2022)
✅ Converts CO and hydrocarbons to safer exhaust gases
✅ Shields downstream aftertreatment systems from added load
✅ Built to handle high exhaust temperatures and extended use
✅ Direct-fit construction simplifies installation
Applications
This DOC is ideal for heavy-duty trucks, tractors, or equipment featuring Cummins X12 or X15 engines produced between 2018 and 2022. It is used in exhaust systems that include SCR, DPF, or other post-combustion treatments.
Installation Notes
Allow the engine and exhaust to fully cool before working. Remove the existing DOC and inspect adjacent flanges, piping, seals, and sensors for wear or damage. Install the new DOC with fresh gaskets, torque fasteners to Cummins specifications, and verify that all connections are sealed properly. After installation, run diagnostic checks and monitor exhaust behavior under load to confirm proper function.
Final Thoughts
For effective exhaust control and system protection, this DOC for X12 / X15 delivers the right combination of construction, performance, and compatibility. It supports reliable downstream treatment and helps keep your exhaust system working cleanly.