When you operate diesel vehicles like fire trucks or municipal trucks, staying compliant with emissions standards is nonnegotiable—and that’s where the DEF head plays a starring role. The E-ONE Cummins ISL DEF Head Unit (OEM 5142426-01) is a critical control point in your vehicle’s exhaust aftertreatment system. If this unit becomes faulty, you risk system errors, derates, and disrupted service. Investing in the right replacement keeps your fleet reliable and emissions-compliant.
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Monitors DEF fluid temperature, concentration, and level to deliver precise dosing into the SCR (Selective Catalytic Reduction) system
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OEM 5142426-01 ensures direct compatibility with Cummins ISL engines in E-ONE applications
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Prevents emissions fault codes, system warnings, and engine derates caused by defective readings
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Built to resist vibration, corrosion, and thermal stress common in heavy duty use
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Designed for straightforward drop-in replacement to reduce downtime
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Restores accurate data to your engine control module, allowing smooth system operation
A failing or degraded DEF head can lead to unexpected complications—don’t leave it to chance. By choosing the OEM 5142426-01 E-ONE Cummins ISL DEF Head Unit, you’re securing reliability, regulatory compliance, and peace of mind in one essential component. Keep your emissions system in top shape and stay ahead of costly surprises on the road.



























































































































































































































































































