Rick's Free Auto Repair Advice

Posts Tagged: oil sensor

Oil light on

Oil light is on All engines are equipped with an oil pressure sensor, also called a sending unit. If the vehicle has a gauge, the sending unit sends a varying voltage to the gauge. But if the vehicle just has an oil light, the sending unit lights the light only when oil pressure is below specifications—usually less than 7-psi. That’s why the oil light is on at startup when the oil pressure hasn’t yet built up to spec. Once the pressure reaches the minimum level, the light goes out. What … Read More


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