Oil Pressure Sensor
An engine sensor that measures the pressure of the lubricating oil and sends this data to the instrument cluster or engine computer.
The oil pressure sensor (or pressure sending unit) is an electrical switch or transducer threaded into the engine block. It monitors the pressure of the engine oil exiting the oil pump and transmits this data to the dashboard gauge or the engine control module (ECM).
If oil pressure drops below a critical threshold (typically 5–10 PSI at idle), the sensor completes a circuit to illuminate the oil pressure warning light on the dashboard, warning the driver of potential engine starvation.
Sensor failure is common, often leading to inaccurate readings, oil leaks through the sensor's electrical connector, or a false low-oil-pressure warning. Replacing a failing sensor is important to ensure accurate monitoring of critical engine oil pressure.