Caterpillar Fault Code
Free · no signupSPN 101 FMI 15
Oil Leaking from Breather.
System
Engine
Symptom
Oil Leaking from Breather.
Diagnosis & fix steps
LOGIC: High Crankcase Pressure.
ACTION: Change the Crankcase Breather Filter (Coalescer). Check for excessive "Blow-by."
Red Seal field insights
RED SEAL FIX: If the filter is new and pressure is still high, a piston ring is likely cracked or stuck.
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