SPN 5246 FMI 15: SCR System Fault & Derate Solutions
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FAQs About SPN 5246 FMI 15 SCR System Fault
What does SPN 5246 FMI 15 mean?
SPN 5246 FMI 15 indicates an SCR (Selective Catalytic Reduction) system fault with derate active, often caused by issues like DEF quality, sensor failures, or exhaust aftertreatment problems.
How do I fix a derate condition caused by SPN 5246 FMI 15?
First check DEF quality and levels, inspect SCR system components for damage, verify NOx sensor operation, and reset fault codes after repairs. Severe cases may require dealership diagnostics.
Can I continue operating equipment with SPN 5246 FMI 15 active?
While possible, continuing operation with active derate may lead to reduced performance and potential engine damage. Address the issue promptly to avoid costly repairs.