subaru_forester01

I looked up how to splice Boeing 787 shielded avionic wire and followed that basic approach of creating shielded wire repair splices. I ended up getting some 16 gauge shielded wire and doing several repair splices with the aid of solder sleeves where the pack rats bit through the wire. Seems to be working as the Check Engine light is no longer on.

My Forester has a P0327 code. I checked the voltage on the shielded wire coming from the wiring harness to the sensor and it is 0.01 volts, not 2.5 or 5 volts. We have a recurring problem with pack rats getting into the engine compartment. I kill them within a day of discovery, but they do a lot of damage just overnight. The wire coming out from the ECU/ wire harness to the knock sensor pigtail has several rat bites in it, so I assume the 0.01 volt reading is due to another cut in the wire somewhere upstream of where I found the cuts. The harness is very tight and seems largely inaccessible from the knock sensor back toward the firewall, so was thinking of adding a new wire back to the knock sensor from closer to the ECU. Any thoughts or suggestions about adding a new shielded wire? The car has 176,000 miles and runs great, I've owned the car since it was new. The Subaru dealer suggested not worrying about it, but if I can get the sensor working again and get rid of the check engine light without completely disassembling the engine to get to the whole wiring harness, I'd like to fix it. Thanks.