Deutz Fault Code

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Code 4-1-2 / SPN 100 FMI 4

Oil Warning Lamp On at Key-On

System

Lubrication

Symptom

Oil Warning Lamp On at Key-On

Diagnosis & fix steps

LOGIC: Oil Pressure Sensor Signal Voltage Low (Short to Ground). ACTION: Inspect oil pressure switch/sensor wiring harness running along oil pan frame for chafing or direct contact with engine block.

Red Seal field insights

False Alarm: A grounded signal wire forces the EMR to register zero oil pressure regardless of true engine lubrication pump output.

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