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Do you have access to a scan tool that can read actual values? This way you can determine if the camshaft position senors are functioning. Have you pulledthe connectors and see if there is oil in the plug connections to the sensors?
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The Porsche adjusters do not necessarily fail but intermittently get sluggish. Hence the intermittent fault. I know those sensors you are replacing are expensive. When you clear the fault, how long does it take for the fault(s) to return?