Caterpillar Fault Code
Free · no signupCA428
Water in Fuel lamp; Rough running.
System
Fuel
Symptom
Water in Fuel lamp; Rough running.
Diagnosis & fix steps
WIF Sensor High Voltage.
LOGIC: Sensor circuit sees >4.5V (saturated).
ACTION: Drain water separator.
FIX: Drain bowl; replace WIF sensor.
Red Seal field insights
Africa's high humidity leads to constant water in fuel. Drain the bowl daily to save the injectors.
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