The Oil Control Valve (OCV) is responsible for metering oil to the AVCS system that moves the intake cams around on 2015-2021 WRX, and all other FA/FB Subarus. We've seen some weird problems caused by failed or failing oil control valves. Sold individually. Part number 10921 on the diagram. Priced per solenoid; there are four in total.
Fits:
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