Restore Exhaust Efficiency with Cummins ISB DOC
What is it?
The Diesel Oxidation Catalyst (DOC) for the Cummins ISB engine is a key emissions-control component. It helps convert harmful exhaust gases like hydrocarbons (HC) and carbon monoxide (CO) into less harmful substances, while supporting the flow and performance of downstream aftertreatment elements.
Why choose this DOC?
Built to match the Cummins ISB engine, this DOC restores effective exhaust gas processing. A failed or clogged DOC can cause restricted flow, increased back-pressure, and regeneration problems. Choosing the right replacement helps return your system to efficient and compliant operation.
Key Benefits
✅ Converts HC and CO emissions for cleaner exhaust output
✅ Supports downstream DPF and SCR components to operate smoothly
✅ Reduces exhaust back-pressure and improves flow
✅ Direct-fit replacement—no modifications needed
✅ Engineered for heavy-duty performance and durability
Applications
Ideal for vehicles equipped with the Cummins ISB engine, covering a wide range of medium-duty trucks, buses, and vocational equipment where effective emissions control and system reliability are essential.
Installation Notes
Before installation, let the exhaust system cool and inspect the catalyst housing and exhaust connections. Replace seals, clamps and ensure proper alignment. After fitting the new DOC, clear fault codes and monitor exhaust temperature and system diagnostics to verify correct function.
Final Thoughts
When your ISB engine begins showing signs of restricted exhaust, repeated regeneration faults, or increased emissions output, the correct DOC replacement is the solution. It restores exhaust system flow, improves performance and supports long-term reliability.