Peugeot 307 Knock Sensor Problems

Problems mentioning the Knock Sensor on the Peugeot 307
Needs ox sensor

I have been told it needs one but why?

2009 307cc
Posted: Sep 30, 2021
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What problems can be caused by a faulty Knock Sensor?
Engine doesn't start up and/or cuts out when running
Check Engine warning light showing on dashboard
Engine is running rough
Engine is misfiring
Engine does not sound or feel normal