E-ONE Cummins ISL

Plug‑and‑Play DEF Control: Cummins ISL Head Unit OEM 724135

What Is It?

This DEF head unit (OEM 724135, Tamerx part 5410‑22‑FA01‑3) is a remanufactured emissions control module for Cummins ISL engines in E‑ONE chassis. It combines DEF level sensing, temperature monitoring, suction flow detection, and includes a 40 micron dosing header for clean fluid delivery.

Why Choose OEM 724135?

Engineered to Cummins and E‑ONE specifications, this head unit delivers plug-and-play integration with existing DEF tank wiring and ECM logic. It offers factory-calibrated performance right out of the box, minimizing emission errors and system downtime.

Key Benefits

✅ Designed for Cummins ISL engines in E‑ONE emergency vehicles 
✅ Accurate DEF level, temperature, and suction detection
✅ Built-in dosing header with 40 µm filter for contamination protection
✅ Direct-fit installation—no modification to wiring or tank required
✅ Remanufactured OEM quality with 1-million-mile or 1-year warranty 

Applications

Commonly used in E‑ONE fire trucks and chassis equipped with Cummins ISL engines, this DEF head unit supports SCR-controlled NOₓ reduction in emergency vehicles around the world.

Installation Notes

Professional installation is recommended. Before installation, inspect DEF tank connections and harness fittings for cleanliness and damage. Use Cummins-compatible diagnostic tools afterward to clear fault codes and verify proper system operation, including fluid level and temperature reporting.

Final Thoughts

The OEM 724135 DEF head unit provides reliable DEF system operation for E‑ONE chassis using Cummins ISL engines. With direct-fit accuracy, clean fluid control, and warranty backing, it helps fleets maintain emissions compliance and avoid system interruptions.