SPN 97 FMI 0
Water in Fuel Indicator — Value too high (most severe).
The reading is valid but far above the normal operating range — high enough that the controller treats it as the most serious level of 'too high'.
What the SPN covers: Signals that the fuel/water separator has collected enough water to trip its sensor. More on SPN 97.
What FMI 0 usually points to: A real over-condition (over-temperature, over-pressure, overspeed) or a sensor reporting a believable but wrong high value. More on FMI 0.
Severity
MEDIUM — fix soon
Drain the separator soon. Water reaching a common-rail system can destroy injectors and pumps.
Likely causes
- Water collected in the separator bowl
- Contaminated fuel from the supply
- Faulty water-in-fuel sensor or wiring
Checks & fixes (easiest first)
- Drain the water separator
- Check fuel from the tank bottom for water
- Inspect the WIF sensor and connector
- Replace the filter element if contaminated
FAQ
What does SPN 97 FMI 0 mean?
Water in Fuel Indicator — value too high (most severe). The reading is valid but far above the normal operating range — high enough that the controller treats it as the most serious level of 'too high'.
Is SPN 97 FMI 0 serious?
Drain the separator soon. Water reaching a common-rail system can destroy injectors and pumps.
What should I check first for SPN 97 FMI 0?
Drain the water separator; Check fuel from the tank bottom for water; Inspect the WIF sensor and connector.