You need to work through and fix any and all existing problems which may be causing error codes. PERIOD. Just because they didn't recur this time around doesn't mean there's not a problem there too... but for now start on the problems which are recurring at a high rate: ie. the knock circuit.
I'm not promising that the wiring will solve the code 52... I've never seen your car. But the wiring is the more common point of failure and it's MUCH less expensive to replace than the two sensors.
Code 42? Speedometer also not working?
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