John Deere Fault Code
Free · no signup97.03 / .04
Alarm buzzer; Warning light; Possible engine shutdown.
System
ECU
Symptom
Alarm buzzer; Warning light; Possible engine shutdown.
Diagnosis & fix steps
Water in Fuel Sensor High/Low.
LOGIC: The sensor in the primary fuel bowl detects conductivity (water) at the bottom of the filter.
ACTION: 1. Drain the fuel/water separator.
2. Check the sensor plug for corrosion (false readings).
FIX: Drain water from fuel system; replace fuel filters; or replace the Water-In-Fuel sensor.
Red Seal field insights
Deere sensors are very sensitive. If the bowl is clear but the code stays, the pins in the connector are likely corroded from the moisture. Replace the pigtail and the sensor together.
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