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chk.eng. light came on in my 05 durango 4.7 it says knock sensor what is it for and where is it located thanx for the help guys
 

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2009 Dodge Challenger R/T
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It checks for spark knock so the pcm will reduce timing if it detects any. I think there may be two but I'm not sure of the exact locations. May want to try a Google search if you don't get an answer soon.
 
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