Anytime that I have checked a knock sensor is with using a scan tool, monitoring the engine timing, and a hammer. I would simply rap on the engine block with the hammer and watch the engine timing change. The knock sensor is simply an output sensor. It is actually a piezo-electric output device. As this material is strained (i.e. an engine knock), it outputs a very small voltage to the PCM. The PCM reads this signal and proportionately retards the timing to prevent the knocking. In all the years that I have worked in the garage I have never replaced a knock sensor nor have any of the other guys unless there was a damaged connection or wire. I am going to do a little more research on that code 43?. It may be the ESC itself not reacting properly to the engine knock. I will get back to you.
PS I have simply rapped on the engine block with a hammer and listened for an RPM change (because of the engine retard). It is quick to do and may help.
1992 Bonneville SSEi
White, grey Leather interior.
Tinted windows and blackouts on headlights.
Custom high flow exhaust, Everything replaceable - DONE
300 000 kms original engine, tranny 2 rebuilds.
Playboy Bunnies Embossed in Tint. Oh Yah!
Ever Seen a Polar Bear in a Snow Storm?