What is SPN 96 FMI 3 & How to Solve It?

What is SPN 96 FMI 3:

SPN 96 refers to Fuel Level, and FMI 3 indicates the voltage is above the expected range.

This typically means the fuel level sensor is sending a high or unrealistic reading, which could mislead fuel usage tracking or trigger warnings.

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Why This Happens

• Faulty fuel level sensor.
  
• Short to power in the sensor wiring.
  
• Improperly grounded sensor or signal interference.
  
• Sensor connector corrosion or moisture intrusion.
  

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How to Fix It

1. Inspect the fuel level sensor wiring and connector.
   
2. Test the sensor with a multimeter and compare values to spec.
   
3. Repair or replace the sensor if values are incorrect.
   
4. Check for short circuits or open grounds.
   
5. Clear the code and verify fuel level reading is accurate.
   

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How to Avoid It Before It Happens

1. Replace fuel sensors proactively if readings begin to drift.
   
2. Protect sensor wiring from moisture and abrasion.
   
3. Calibrate fuel level sensors periodically.
   
4. Use sealed connectors on fuel system sensors.