2008 Impreza 2.5 SOHC - blue and white sensors

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What are there blue and white sensors for just above the timing belt cover?
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Oil Switching Solenoid Valve (OSV) (Blue)
Oil Pressure Switch (Grey)

Part and purchase

The "car doctor"

"Variable valve timing (VVT) helps to provide smoother idling, better power delivery and improved fuel economy. VVT also aids in emissions control. In order to achieve all of these tasks, your VVT system requires a number of different components including the variable valve timing solenoid. The VVT solenoid is responsible for changing the position of the camshafts in the engine. It works on oil pressure, and can either advance or retard cam position to provide the correct engine performance. Each of the camshafts are equipped with a VVT solenoid.The purpose is to alter the advance or retard position of camshaft depending on the speed and load of the engine through various RPM ranges.

See images of a 2012 Outback
 

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