FREIGHTLINER, MERCEDES-BENZ

LI49.20-N-076565

2025-07-23 · NHTSA 11021170

إدراج السيارة هو نقطة بداية للبحث. تحقق من المحرك وفترة الإنتاج والبرمجيات في معلومات الشركة المصنعة.

ملخص الشركة

النص الأصلي بالإنجليزية

Check engine light with fault code P300E3B in the CDI control unit CDI (N3/28) Complaint Check engine light is illuminated with fault code P300E3B “The efficiency of component 'SCR catalytic converter' is not sufficient" stored in the CDI control unit (N3/28). Cause Excessive ammonia slip is being detected in the SCR system, often triggered by IUMPR (In-Use Monitor Performance Ratio) thresholds. This typically indicates that the SCR catalyst is not converting DEF (AdBlue) efficiently under moni- tored conditions. Common Driving Scenario: •Non-dynamic driving (e.g., highway cruising with cruise control set) •Minimal load changes, steady-state exhaust flow Contributing Factors: •Software influence – IUMPR (In-Use Monitor Performance Ratio) thresholds •DEF Overdosing – Over-injection due to faulty NOx sensors, dosing valve issues, or poor DEF quality •Low Exhaust or Catalyst Temperatures – Common under low-load conditions; reduces SCR conversion efficiency •Catalyst Degradation or Contamination – Aging catalyst or contamination from oil, coolant, or poor-quality DEF Remedy IMPORTANT: Do not replace any components unless instructed through TIPS. For Model Year 2019–2021 Vehicles: •Update the following control units to the latest available software: N3/28 – Motor Electronics 'CDI61NFZ' for combustion engine 'OM642' (CDI):

نجمع فقط التسجيلات ذات الشركة والرقم والتاريخ والملخص الكامل المتطابقة ونحتفظ بالأرقام والوثائق القديمة. نعرض الاستبدالات الصريحة المثبتة فقط. تُفصل علاقات ما قبل 1994 عن النتائج الافتراضية. عدم تحديد السنة لا يعني كل السنوات.