Improve Exhaust System Efficiency with Cummins ISB 6.7 DOC
What is it?
The Diesel Oxidation Catalyst (DOC) for the Cummins ISB 6.7 engine is an essential after-treatment component designed to oxidize hydrocarbons (HC) and carbon monoxide (CO) in the exhaust stream. This oxidation process supports downstream emissions systems and helps maintain overall engine efficiency.
Why choose this DOC?
Designed specifically for the Cummins ISB 6.7 engine, this DOC offers precise fit and reliable performance. When a DOC becomes degraded or blocked, it can cause elevated back-pressure, repeated regeneration issues, or emissions fault codes. Installing the correct replacement part helps restore exhaust flow and system balance.
Key Benefits
✅ Converts harmful exhaust gases into less-harmful output
✅ Supports healthy operation of downstream DPF and SCR systems
✅ Helps reduce back-pressure and exhaust restriction
✅ Direct-fit design—no modifications required
✅ Built for heavy-duty use and high-temperature conditions
Applications
Ideal for trucks, buses, and industrial equipment equipped with the Cummins ISB 6.7 engine, especially in operations where emissions control and system reliability are mission-critical.
Installation Notes
Before installation, allow the exhaust system to cool. Inspect the catalyst housing, mounts, and connections for soot or damage. Replace all gaskets, seals, and clamps to ensure a secure, leak-free installation. After fitting the new DOC, clear any diagnostics codes and confirm proper system performance.
Final Thoughts
If your ISB 6.7 engine is experiencing frequent after-treatment faults, reduced exhaust flow, or higher back-pressure, replacing the DOC is a crucial step. With the right fit and built-for-duty construction, this part helps maintain efficient performance and keeps your engine running reliably.