Cummins ISB DOC

Emissions System Component: Cummins ISB DOC

What is it?
The Cummins ISB Diesel Oxidation Catalyst (DOC) is a component used in the after-treatment system of ISB engine platforms. It performs oxidation of hydrocarbons (HC) and carbon monoxide (CO) in the exhaust stream to support cleaner emissions and help downstream equipment like DPFs and SCR systems work effectively.

Why Choose the Cummins ISB DOC?
This DOC is designed with the correct fitment and flow characteristics for the ISB engine family. Choosing a part specified for your engine helps ensure the exhaust stream flows as intended, sensor alignment is accurate, and system reliability is maintained.

Key Benefits
✅ Fits properly with factory mounting and sensor ports
✅ Constructed to endure heavy exhaust duty cycles and high-temperature environments
✅ Helps reduce HC and CO emissions through oxidation
✅ Supports after-treatment system stability and reliability
✅ Protects downstream components by presenting cleaner exhaust for them to handle

Applications
This DOC is suitable for vehicles and equipment equipped with Cummins ISB engines. It’s commonly used in commercial trucks, vocational equipment, and other applications where after-treatment performance and emissions control are important.

Installation Notes
Professional installation is recommended. Verify your engine model and serial number match the ISB configuration. Remove the existing DOC, inspect mounting surfaces and sensors, replace any worn gaskets or seals, and install the new unit with proper torque. Reconnect all sensors, clear diagnostic fault codes, and then run the system to confirm normal exhaust behavior.

Final Thoughts
For reliable emissions control and after-treatment system operation, the Cummins ISB DOC provides a properly matched oxidation catalyst solution—helping your engine system run clean, compliant and dependable.