So I have an 89 Turbo, and I've done the rewire of the knock sensors a few months back. A few days ago I had code 52 pop back up again, so I figured I'd get a new knock sensor. After installing it, and pulling EFI fuse, code 52 was gone for a FULL DAY. Now I have code 11. I've sanded my grounds and made sure they're nice and tight, but I'm still getting the code. So my question to you guys, is code 52 and 11 related? The code was never there before, then out of nowhere, bam. Also, could I "jump" a temporary ground from under the Intake Manifold where the ECU grounds are to the negative battery terminal just to see if thats what it is? All help will be greatly appreciated. PS: Grounds I've sanded are the ones that go from the Negative terminal, to the right side of the fuse box, the one from the negative terminal to the block, and the ones for the ECU on/near the Intake manifold.