> Hello Bmw chronies once again. I have come across a problem with knocking
> and pinging, but am not too sure if it is the knock sensor or the timing
> chain. There was no check engine light on, but the sensor has a crack in it.
> It does not look like a very easy job, so I am asking if the check engine
> light must be on in order to have a bad sensor or can this sensor not be
> detected so easily by the onboard computer?