2007 Mazda CX-7 Q&A

2007 Mazda CX-7 Question: Knocking (ping) in the top of engine passenger side and Im not sure what to do.

A family friend said it sounds like a valve. Im not sure what that means or how much it is going to cost. 2 years ago, I had the turbo replaced at a cost of $3200 at the dealership. -
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