The derate light is still on, no codes in any module. The aftertreatment system is working perfect, when dosing DEF there is a 75% or more reduction in NOX, less than 20 ppm at 2,500 RPM. ![]() The 1036 code cleared out shortly after performing this procedure. The shop replaced the NOX2 and I did the appropriate resets and regen with Texa. The NOX 2 was bad causing false DEF quality derate. The truck initially had a P1036 - NOX sensor heater performance 2. ![]() This truck has the EXH SYSTEM message, derate lamp, and flashing DEF lamp.
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