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SPN 100 FMI 1

Engine Oil Pressure — Value too low (most severe).
The reading is valid but far below the normal operating range, at the most serious 'too low' level.

What the SPN covers: Engine oil pressure measured in the main oil gallery. More on SPN 100.

What FMI 1 usually points to: A real under-condition such as very low oil pressure or low fuel pressure, or a sensor that has drifted low. More on FMI 1.

Severity

STOP — shut down if the condition is real

If oil pressure is truly low, shut the engine down. Running with low oil pressure can wreck bearings in minutes.

Likely causes

  1. Low oil level
  2. Failed oil pressure sensor or wiring
  3. Worn oil pump or bearings
  4. Oil diluted with fuel or coolant
  5. Clogged pickup or filter

Checks & fixes (easiest first)

  1. Check oil level and condition (smell for fuel, look for milky coolant)
  2. Verify actual pressure with a mechanical gauge before replacing parts
  3. Inspect sensor connector and wiring
  4. Check for related oil temperature codes

FAQ

What does SPN 100 FMI 1 mean?

Engine Oil Pressure — value too low (most severe). The reading is valid but far below the normal operating range, at the most serious 'too low' level.

Is SPN 100 FMI 1 serious?

If oil pressure is truly low, shut the engine down. Running with low oil pressure can wreck bearings in minutes.

What should I check first for SPN 100 FMI 1?

Check oil level and condition (smell for fuel, look for milky coolant); Verify actual pressure with a mechanical gauge before replacing parts; Inspect sensor connector and wiring.