Cummins ISB 6.7 DOC

A Cleaner Exhaust Solution for Your Cummins ISB 6.7 Engine

What is it?
The Diesel Oxidation Catalyst (DOC) for the Cummins ISB 6.7 engine is a vital emissions-control component. It oxidizes hydrocarbons (HC) and carbon monoxide (CO) present in the exhaust stream into cleaner, less harmful gases, enabling the aftertreatment system and exhaust path to operate smoothly and reliably.

Why choose this DOC?
Engineered specifically for the ISB 6.7 engine (2014-2017 model years), this DOC meets the original equipment manufacturer’s design specifications—ensuring proper exhaust-gas flow, correct back-pressure characteristics, and rugged, durable construction. Using a correct-fit, high-quality DOC helps reduce the risk of diagnostic fault codes, excessive exhaust resistance, or premature failure of downstream components.

Key Benefits
✅ Drop-in compatibility with ISB 6.7 engine applications
✅ Efficient conversion of HC and CO into cleaner exhaust output
✅ Maintains proper exhaust-gas flow characteristics for downstream aftertreatment components
✅ Direct-fit design: no modifications required
✅ Built to endure heavy-duty, high-temperature, corrosive exhaust environments

Applications
This DOC is designed for medium-duty trucks, vocational vehicles, buses and other equipment powered by the Cummins ISB 6.7 engine (2014-2017 model years). It is especially applicable in operations where consistent emissions control and dependable exhaust system behavior are essential for daily operation.

Installation Notes
Before servicing, ensure the exhaust system and after-treatment components have cooled completely. Remove the existing DOC and thoroughly clean the mating surfaces and inspect adjoining exhaust hardware for soot accumulation, cracks, or damage. Install the new DOC using new gaskets, clamps, and seals. Secure fasteners to manufacturer torque specifications. After installation, clear any emissions fault codes and use diagnostic tools to verify proper exhaust flow and system integrity.

Final Thoughts
If your ISB 6.7-equipped engine is showing signs of emissions alerts, elevated exhaust restriction, or inconsistent after-treatment system performance, replacing the DOC with the right-fit, quality unit is a practical way to restore reliable, clean exhaust flow. This component plays a critical role in maintaining the integrity of the entire emissions control chain and supporting dependable equipment operation.