Cummins ISB 6.7 DOC

Reliable Emissions Control for Your Cummins ISB 6.7 Engine

What is it?
The Diesel Oxidation Catalyst (DOC) designed for the Cummins ISB 6.7 engine (model years 2014–2017) is a key emissions-control component. It oxidizes hydrocarbons (HC) and carbon monoxide (CO) in the exhaust stream, converting them into cleaner by-products before exhaust gases proceed to downstream aftertreatment components.

Why choose this DOC?
This DOC is built to Cummins’ original specifications for the ISB 6.7 engine family, ensuring proper exhaust-gas flow, correct back-pressure characteristics, and durable construction. Genuine units help ensure emissions systems operate as intended, reducing the risk of diagnostic faults, increased restriction, or premature failures associated with sub-par replacements. 

Key Benefits
✅ Direct-fit compatibility with ISB 6.7 engines (2014–2017) 
✅ Efficient conversion of HC and CO into cleaner exhaust output
✅ Maintains correct exhaust flow characteristics for downstream systems
✅ Designed for high-temperature, heavy-duty use with durable construction
✅ Helps protect the rest of the emissions-control chain by ensuring optimal exhaust conditions

Applications
This DOC fits medium-duty trucks, vocational vehicles, buses and other equipment equipped with Cummins ISB 6.7 engines from 2014 to 2017. It’s especially relevant where emissions standards must be met, and where the aftertreatment system’s reliability is critical.

Installation Notes
Ensure the exhaust system is fully cooled before beginning work. Remove the existing DOC, clean the mating surfaces thoroughly, inspect adjacent pipes and hardware for signs of damage or heavy deposits. Install new gaskets, clamps, and seals. Fit the replacement DOC, torque fasteners to manufacturer specs. After installation, inspect for leaks, clear emissions‐system fault codes, and verify that the exhaust and after-treatment system is functioning properly via diagnostics. 

Final Thoughts
If your ISB 6.7-equipped vehicle is showing emissions alerts, elevated back-pressure, or inconsistent after-treatment behaviour, replacing the DOC with the correct fitment unit is a practical way to restore reliable exhaust flow and support emissions system integrity. This component plays an essential role in ensuring the entire emissions control chain functions as intended—helping your equipment remain compliant and dependable.