I just had mine go. Bought a handheld scanner and it pulls these two codes even after clearing them:
135C11 Valvetronic servomotor position sensors: Signals implausible
135A08 Valvetronic,servomotor position sensors:signal
implausible
I hear the ticking/grinding noise when I unlock the car. My kids heard it today when we were emptying the trunk after we drove it so the valve tronic must run again shortly after the car is turned off as well as before.
I have the extended warranty so I'll take it into the shop and update everyone on what they decided to do.
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