Navistar/International IC Bus Cummins ISB 6.7L, B6.7 DEF Head Unit

Restored DEF Functionality for IC Bus: OEM DEF Head Unit (4353004C92), 2014–2024

What is it?
The OEM 4353004C92 DEF Head Unit is a remanufactured DEF (Diesel Exhaust Fluid) header assembly made for Cummins ISB 6.7L / B6.7 engines in Navistar / International IC Bus models from 2014 through 2024. This unit mounts atop the DEF tank, integrating sensors that monitor DEF fluid level, temperature, and support Quiet Level Sensing (QLS) systems to ensure proper SCR emissions control.

Why choose this OEM DEF Head Unit?
Manufactured to meet factory specs, this unit delivers accurate sensing, correct sealing, and full compatibility with the vehicle’s emissions controls. Using the genuine part helps avoid frequent DEF system faults, warning lights, fluid level errors, or abnormal diagnostics often caused by aftermarket, mismatched components.

Key Benefits
 ✅ Direct-fit for IC Bus Cummins ISB 6.7L / B6.7 (2014–2024)
 ✅ OEM sensors and header design maintain proper DEF monitoring under QLS system
 ✅ Proper sealing and construction to prevent leaks and protect DEF fluid integrity
 ✅ Reduces DEF “header” error codes and avoids de-rates or operational limitations due to DEF faults
 ✅ Backed by a one million mile or one-year warranty from TamerX – remanufactured to OEM quality standards

Applications
Ideal for IC Bus school and transit buses equipped with Cummins ISB 6.7L / B6.7 engines. This DEF Head Unit is critical when your IC Bus shows DEF system warning lights, inaccurate fluid level readings, or when performing scheduled DEF system maintenance or SCR overhauls.

Installation Notes
Install with the engine off and DEF system depressurized. Clean DEF tank openings and inspect where the header unit mounts. Replace any worn O‑rings or gaskets. Torque to OEM specifications. After install, verify correct sensor output and clear any DEF‑related fault codes; monitor for proper function and fluid level detection.

Final Thoughts
If your IC Bus is giving DEF monitoring trouble or emissions warnings with an ISB 6.7L / B6.7 engine, the OEM 4353004C92 DEF Head Unit restores accurate level sensing, system reliability, and emission compliance. Built to factory standards and backed by warranty, it helps ensure your bus stays on the road and runs clean.