Knock sensor = brake, abs, check engine soon lights?
 

My "check engine soon" light came on and the code reads: PO332. I know its for a knock sensor. Where exactly is it located? Another wierd thing that is happening, is lately while driving my red "brake" light will flash and the "abs" light will stay on. The speedo also freaks out. I'm just guessing that all 3 warning lights are some how connected. What should I start working on first?