Freightliner Cummins B6.7, ISL L9, X12, X15 DEF Head Unit

Emissions Stability for Freightliner Cummins: OEM DEF Head Unit

What is it?
The OEM DEF Head Unit is a factory-specified header assembly designed for Freightliner trucks fitted with Cummins B6.7, ISL L9, X12, or X15 engines using SCR (Selective Catalytic Reduction) systems. It mounts on the DEF tank to house sensors that monitor fluid level, temperature, and ensure correct fluid dosing.

Why choose this OEM DEF Head Unit?
This unit is built to Cummins and Freightliner OEM specifications, ensuring accurate sensor calibration, robust sealing, and plug‑and‑play compatibility with the vehicle’s emissions control systems. Using the genuine component helps avoid warning lights, sensor faults, leaks, or SCR system derates commonly caused by mismatched aftermarket parts.

Key Benefits
 ✅ Direct‑fit for Freightliner trucks with Cummins B6.7, ISL L9, X12, X15 engines
 ✅ Accurate DEF fluid level and temperature sensing
 ✅ Sealed design that prevents leaks and protects system integrity
 ✅ Supports factory diagnostics and SCR control integration
 ✅ Durable construction for sustained, heavy-duty service

Applications
Ideal for Freightliner models in vocational, regional, and highway service using Cummins engines across the B6.7 to X15 range. This head unit is crucial for maintaining emission system reliability in fleets requiring consistent SCR functionality.

Installation Notes
Have a certified technician perform installation. Deactivate or depressurize the DEF system before removal. Clean the mounting surface and replace any O‑rings or gaskets. Install the head unit using the required torque specs. After installation, verify sensor outputs, clear DEF-related fault codes, and confirm proper SCR system behavior.

Final Thoughts
If your Freightliner with a Cummins B6.7, ISL L9, X12, or X15 engine is experiencing DEF errors, sensor anomalies, or leaks, the correct OEM DEF Head Unit offers a factory-grade solution. Restoring accurate sensor function and sealing helps maintain emission compliance and reliable operation over time.