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I appear to have cured my CEL problem with 1-4-3 knock sensor
by simply giving the large connector behind the drivers side strut tower a thorough cleaning with de-ox-it. This conenctor is where the harness that runs into the cabin mates with the harness that runs under the hood. It was not visually dirty or corroded inside, but separating the halves, polishing the male ends and cleaning both sides of the connection with De-Ox-It does seem to have cured the code problem. I lubed up the outside mating surfaces of the plastic connectors with dielectric grease, since the things were a royal pain to get separated.
FYI, there are two large connectors there. I cleaned BOTH, since I figured they'd both probably benefit. But if you want to deal with only one, you can easily tell which one carries the knock sensor wire since that wire is green is fatter than most of the other wires.
However, the car still does not run with as much pep as it should. It feels anemic compared to my 240. So what I thought was the computer reacting to a bad signal from the knock sensor and causing poor performance thru retarded timing may well be something different. :-(
Tom--thanks for reminding me to post this answer in this thread, too!
John
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