Cummins ISB DOC

Essential Emission Control: Cummins ISB DOC

What is it?
The Cummins ISB Diesel Oxidation Catalyst (DOC) is a critical component in the after-treatment system for ISB series engines. Its function is to oxidize hydrocarbons (HC) and carbon monoxide (CO) in the exhaust stream, preparing the gases for further treatment and helping maintain emissions compliance. 

Why Choose the Cummins ISB DOC?
This DOC is designed to meet the exact specifications required by the ISB platform—correct flow path, mounting configuration, and sensor interface are incorporated. By selecting the right DOC, you ensure proper exhaust dynamics, help prevent back-pressure issues, and support the longevity of the entire after-treatment system.

Key Benefits
✅ OEM-style fitment: mounts and sensor ports align with factory design.
✅ Built for heavy duty: handles high exhaust temperatures and continuous operation.
✅ Effective conversion: reduces HC and CO to cleaner exhaust emissions.
✅ Improved system reliability: helps minimize emissions-related faults and maintenance.
✅ Protects downstream parts: supports DPF, SCR, and sensor health by delivering cleaner exhaust.

Applications
This DOC is suitable for Cummins ISB engines used in medium- to heavy-duty trucks and equipment where emission control is essential. It fits applications that require a reliable oxidation catalyst in the after-treatment chain.

Installation Notes
Professional installation is recommended. Confirm the engine model and compatibility before replacing. Remove the old DOC carefully, inspect all exhaust flanges, clamps, sensors and gaskets for damage or soot. Clean mating surfaces thoroughly, install the new unit using correct torque specifications, replace any seals or mounting hardware as needed, reconnect sensors, and clear system fault codes. After installation, monitor exhaust temperatures and system readings to verify proper operation.

Final Thoughts
A properly functioning DOC is foundational to a clean and compliant emission system. The Cummins ISB DOC offers a direct-fit, engine-specific solution designed to maintain system integrity, support downstream components, and help your equipment stay reliable and emission-ready.