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SPN 175 FMI 2

Engine Oil Temperature 1 — Data erratic, intermittent, or incorrect.
The signal jumps around, drops in and out, or disagrees with other information the controller has.

What the SPN covers: Temperature of the engine oil. More on SPN 175.

What FMI 2 usually points to: Loose or corroded connectors, chafed wiring, a failing sensor, or two redundant sensors that do not agree. More on FMI 2.

Severity

HIGH — limit use, diagnose now

High oil temperature thins oil and can damage bearings. Reduce load and get it checked.

Likely causes

  1. Engine overloaded or overheating
  2. Plugged oil cooler
  3. Low oil level
  4. Sensor or wiring fault

Checks & fixes (easiest first)

  1. Check oil level and coolant temperature
  2. Inspect the oil cooler
  3. Compare sensor reading to coolant temp after warmup

FAQ

What does SPN 175 FMI 2 mean?

Engine Oil Temperature 1 — data erratic, intermittent, or incorrect. The signal jumps around, drops in and out, or disagrees with other information the controller has.

Is SPN 175 FMI 2 serious?

High oil temperature thins oil and can damage bearings. Reduce load and get it checked.

What should I check first for SPN 175 FMI 2?

Check oil level and coolant temperature; Inspect the oil cooler; Compare sensor reading to coolant temp after warmup.