Maintain Exhaust Health with Cummins ISB 6.7 DOC
What is it?
The Diesel Oxidation Catalyst (DOC) for the Cummins ISB 6.7 engine is a critical emissions-control component. It oxidizes hydrocarbons (HC) and carbon monoxide (CO) in exhaust gases, preparing them for downstream treatment and helping the entire system operate smoothly.
Why choose this DOC?
Built specifically for the ISB 6.7, this DOC ensures proper fitment and reliable emissions performance. A failing or restricted catalyst can cause increased back-pressure, frequent regeneration attempts, and fault codes. A correct replacement supports less restriction and improved system behavior.
Key Benefits
✅ Converts harmful gases into cleaner exhaust output
✅ Protects downstream DPF and SCR components from premature wear
✅ Helps reduce back-pressure and maintain proper exhaust flow
✅ Direct-fit design—no modifications required
✅ Designed for high-heat, heavy-duty environments
Applications
Ideal for trucks and equipment powered by the Cummins ISB 6.7 engine, particularly where emissions compliance, reliable exhaust flow, and robust system performance are important.
Installation Notes
Ensure the exhaust system is completely cool before servicing. Inspect the DOC housing and connections for damage or soot build-up. Replace gaskets and clamps to ensure a secure, leak-free fit. After installation, clear any fault codes and verify exhaust behavior through diagnostics.
Final Thoughts
If your ISB 6.7 engine is showing symptoms like elevated back-pressure, frequent after-treatment faults, or restricted exhaust flow, installing the correct DOC is a smart move. With proper fitment and quality construction, it helps maintain clean operation and long-term reliability.