Modern diesel exhaust aftertreatment systems depend on accuracy, durability, and timely feedback. The Tenneco DEF Head Unit, built to OEM 82249729 (Tamerx part 1731-13-3) specifications, is one such component that often determines whether your DEF (Diesel Exhaust Fluid) system operates correctly. When it’s faulty—or the wrong version—you can get warning lights, error codes, or even engine derates that disrupt operations.
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Monitors DEF fluid level, fluid temperature, and urea (quality) concentration, giving accurate readings to the engine control module
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Comes with a 40-micron filter and coaxial heater to help maintain fluid cleanliness and prevent freezing or crystallization in cold conditions
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Designed to be 13-inch in height, matching OEM geometry for easier drop-in installation
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Built to handle the wear and tear of everyday use: vibration, thermal cycles, exposure to DEF fluid chemistry
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Helps prevent common faults: system warnings, emissions faults, or derate events triggered by sensor drift or compromised components
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Remanufactured by Tamerx and backed with a one-million-mile / one-year warranty—giving confidence and protection after installation
If you’ve ever experienced DEF system warnings, stall codes, or SCR (Selective Catalytic Reduction) issues, the DEF head unit is one of the first places to check. Choosing the correct OEM-matched unit like the 82249729 ensures you restore system accuracy, reduce downtime, and keep your vehicle emissions-compliant under all conditions.