Navistar MaxxForce 11,13 DOC

Clean-Air Engine Upgrade: Navistar MaxxForce 11/13 DOC (2011–2014)

What is it?
The DOC (Diesel Oxidation Catalyst) for the MaxxForce 11 and MaxxForce 13 engines is a core part of the after-treatment system designed to oxidize hydrocarbons (HC) and carbon monoxide (CO) from the exhaust stream before further processing. This module ensures cleaner emissions and supports overall engine efficiency. 

Why Choose the MaxxForce 11/13 DOC (2011-2014)?
This DOC is engineered for a direct-fit replacement on the MaxxForce 11 and MaxxForce 13 engines built from 2011 to 2014. Choosing a component built to the original equipment specification helps ensure the correct mounting, flow path, sensor alignment and after-treatment system balance—minimizing back-pressure issues and emissions faults. 

Key Benefits
✅ OEM-style fitment with factory-aligned ports and exhaust geometry.
✅ Durable design built to withstand high exhaust temperatures and heavy-duty vibrations.
✅ Efficient oxidation of HC and CO, supporting cleaner emissions and smoother exhaust flow.
✅ Helps maintain system integrity, reducing emissions-related fault codes and downtimes.
✅ Protects downstream components like DPFs, SCR catalysts and sensors by maintaining proper exhaust conditions.

Applications
This DOC is suited for heavy-duty trucks and fleet vehicles equipped with the MaxxForce 11 or MaxxForce 13 engines between model years 2011 and 2014. Ideal for on-road, regional-haul and vocational operations where emissions compliance and switch-out downtime need to be minimized.

Installation Notes
To install, ensure the engine serial number and model year align with the 2011-2014 MaxxForce 11/13 engine range. Remove the old DOC, inspect and clean mounting flanges and sensors for any damage or soot build-up. Replace any gaskets or seals and install the new unit with correct orientation and torques. After installation, monitor exhaust temperature, flow and sensor feedback to confirm the system is operating as intended.

Final Thoughts
A reliable DOC is foundational to a well-functioning after-treatment system. The MaxxForce 11/13 DOC (2011–2014) provides an OEM-matched solution designed to restore clean exhaust operation, support emissions compliance and help your fleet stay on the road with minimal disruption.