P0327 implies that the sensor isn't working properly. That doesn't necessarily indicate that your engine is knocking - just that it can't tell.
IIRC, the sensor on the 2.4 is just above the starter, below the intake manifold towards the rear of the block. It's not hard to change, but the best way to get to it is to remove the intake manifold. Since you already have an intake, that should be pretty straightforward. The intake manifold is held on by 8 to 10 (working from memory here) 10mm nuts and bolts. Unlike the LNF intake manifold, it comes off pretty easily.
If this is an LNF (GXP) - your message doesn't say - then it gets more complicated as removing THAT intake manifold is a horrendous pain in the posterior. But, the knock sensor should be in the same location. If it's an LNF, go ahead and inspect the intake valves for carbon buildup while you have the manifold off.
Here's where it's located on the 2.4 (See attachment).
Blue-ish 2006 2.4, Werks stage 1 turbo, Borla cat-back, DDM braces, Spec aluminum flywheel, Spec stage 2 clutch, Werks aluminum radiator, some gauges, RKSport hood, Morimoto FX-Rs, GReddy Profec, Norm's fenders
'07 GXP, RPM Stage 2, Solocatless downpipe, TCE Wilwood 6 piston front brakes, 4-piston rears , Stainless brake lines, slotted/drilled rotors, BC Racing BR coilovers, Performance Autowerks intercooler, DDMWorks CAI, charge pipes and braces
Last edited by raygun; 03-22-2019 at 11:40 AM.