I believe there are 2 sensors, located at opposite ends of the engine block,
underneath the manifold. I know when I had the sensors replaced 3 years ago, most
of the $300+ cost was the labor to remove and replace the manifold. The actual
cost of the part was about $98. I'm going to talk to my independent Volvo mechanic
again as he had an idea that there might be a little carbon build up on the pistons which could alter the detonation inside the cylinder and that decreasing
the turbo boost might get rid of the knock sensor codes. We'll see.
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