on my 02 Z, im gettin the low input code on #2 knock sensor, so i took the diablo tuner out and took her for a ride after deleting the code. cruisong around everything is normal, at WOT im gettin 3.96 degrees of retard. when i first put the diablo tune on it, i would get a little retard but after a second it would go back up to 0 retard under WOT, now it stays at 3.96 degrees and i can hear some pinging. Bad sensor? if so how do you replace? and i am using premium and regularly run a fuel system cleaner through her.

 

Dunno...maybe it's doing it's job by sensing the pinging? Check the diagnostics at www.gearchatter.com You need to remove the intake to get to the sensor, the intake swap article at www.ls1howto.com shows you how if you have to ge that route. Sorry no definitive answer, TTT for ya.