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2011 Cayenne Turbo engine knocking noise


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2011 Turbo / 76K miles. 

went to post office to mail Xmas cards and engine started to have a terrible knocking noise.  initially, the engine light didn't go on. But next trip out, engine light goes on and noise gets worse,
then the power brakes go out. Thankfully, I was 2 miles from dealer and limped in. I hope its a coil and not a engine replacement. All other gauges were reading perfect. just had it in for brakes and major service 2K ago. Has anyone experienced failed coils on a 2011 or newer?

 

This makes it two years in a row that I had major issues 3 days before Xmas. 

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