if you're getting code 52 more than likely you have a faulty knock sensor or your wiring has corroded
unplug one of your knock sensors and use a piece of a wire to join the plug and the other knock sensor that is still plugged in
if you don't get a check engine light the KS that is unplugged is your faulty one
if you do get a check engine light try the process again but unplug the other one this time and plug the other one back in
easy way to figure out which KS is dead
