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first, I wouldn't assume the STP product cleaned your fuel injectors. I would try a bottle of Techron (black), Redline's SL-1, or maybe Lucas UCL. there really aren't that many cleaners that work as advertised.
I would think OEM plugs are good. I put in Bosch +4s a few months back and so far no problems, but with maybe 10k miles, I can't really recommend them quite yet.
last, but not least, the knock sensor failure would , I assume, result in a less than optimum ignition curve regarding spark advance. the code is telling you the sensor failed, not that you have too much knock. this would reduce fuel economy & power output as a minimum side-effect. I have not changed one myself, but do a search, there are instructions in previous threads here and it didn't seem too hard from what I read.
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