The most common causes of why the oil light is on but the oil dipstick reads good and is full.

Possible Causes Oil Warning Light Comes On But Oil Is Full Dipstick Shows the Correct Level
Oil Sending Unit / Pressure Switch
Oil Pressure Sensor
Wiring
Low Oil Pressure
Old Dirty Oil or Clogged Oil Filter
Wrong Oil
Bad Warning Light
Bad Oil Pump
Clogged Oil Passages

What to Check?
Test Oil Sending Unit or Sensor
Check Wiring
Use Oil Pressure Gauge

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