knock sensor

So basically I've done a bit of a DIY somewhat ghetto intake recently, where I got a Spectre filter from AutoZone and fitted it over the stock rubber intake tube with a metal pipe inside of it to keep it sturdy and give me something to tighten down on. I know this doesn't give any performance...

So I have a 2006 Element awd automatic. The car was really sluggishwhen starting,it was barely turning over, seemed like battery was shot. I took it to a mechanic, he tells me the starter is bad. So I get estimates from Dealer $900 and a local reputable mechanic,$600. Im too cheap and I end...

Hi, Where is the knock sensor located and how do I get to it? Does it involve the removal of a lot of parts? Thanks!