If you’re operating a Ford F-650 or F-750 equipped with the Cummins ISB 6.7 L engine and a 9-gallon DEF tank, then your after-treatment system depends on more than just big components—it relies on parts like the DEF head unit that quietly keep things in balance. The correct head unit crafted to meet OEM DC4Z-5J250-C specifications is the linchpin of your SCR (Selective Catalytic Reduction) system’s accuracy. Without it functioning properly, you could encounter emissions alarms, reduced dosing accuracy, or unexpected downtime.
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Monitors DEF fluid level, temperature, and urea concentration, transmitting accurate data to the engine control module
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Regulates precise dosing of DEF into the exhaust stream so the SCR system can efficiently convert NOx
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Designed specifically for Ford F-650 / F-750 trucks with the Cummins ISB 6.7L and a 9-gallon DEF tank, matching OEM DC4Z-5J250-C calibration
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Helps prevent fault codes, check-engine lights, or engine derates caused by sensor drift or inaccurate readings
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Built to handle truck-duty conditions: vibration, thermal cycling, and exposure to DEF chemical environment
Choosing the wrong head unit—or skipping this part altogether—is a risk that can hit your fleet’s uptime and compliance. By installing the correct OEM-matched unit, you restore the balance of the DEF system, maintain emissions integrity, and ensure your vehicle is ready for work, not unexpected maintenance.


















































































































































































































































































