Recently had the CEL light come on and go off after a period of driving (amount of time before it went off varies). Checked the ECU code and it threw back 22 - Knock Sensor. I am having the usual hesitation problems that go with a faulty knock sensor, but my question is....what if it is not the sensor that is faulty, and my engine is actually knocking?
I have no idea how to tell if it is or not as I have never actually heard and engine knock (apart from on a diesel engine, where this is commonplace i believe). Is it something that I will distinctly hear at idle, or do you have to have a trained ear? I've read somewhere that copper filings in the oil is a good way of telling, and to the naked eye mine has none, although it seems the water in the cooling tank does (could this just be rust from the cap??).
Any help appreicated!