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SPN 97 FMI 15

Water in Fuel Indicator — Value too high (least severe).
The reading is above normal, but only at the lowest warning level.

What the SPN covers: Signals that the fuel/water separator has collected enough water to trip its sensor. More on SPN 97.

What FMI 15 usually points to: An early warning: mild over-temperature or over-pressure, or a sensor starting to drift high. More on FMI 15.

Severity

MEDIUM — fix soon

Drain the separator soon. Water reaching a common-rail system can destroy injectors and pumps.

Likely causes

  1. Water collected in the separator bowl
  2. Contaminated fuel from the supply
  3. Faulty water-in-fuel sensor or wiring

Checks & fixes (easiest first)

  1. Drain the water separator
  2. Check fuel from the tank bottom for water
  3. Inspect the WIF sensor and connector
  4. Replace the filter element if contaminated

FAQ

What does SPN 97 FMI 15 mean?

Water in Fuel Indicator — value too high (least severe). The reading is above normal, but only at the lowest warning level.

Is SPN 97 FMI 15 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 15?

Drain the water separator; Check fuel from the tank bottom for water; Inspect the WIF sensor and connector.