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It's not unusual to see a similar dtc on gm's 3.6. One of the camshaft actuator solenoids is typically at fault. The first couple times the dtc fails is often separated by thousands of miles, making a rock solid diagnosis not possible initially. I'd check on Subaru forums for info to the contrary, but if you had a Gm, the next time the dtc shows its head, I'd replace the related solenoid. For Gm, a solenoid costs less than paying a diagnostic charge, and they're accessible enough for most DIYers.
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