What sensor is this?

[Reddish]

Haven't had chance to get a picture but its a clio 182 and the sensor is just underneath the injectors and above the oil filter. Knock sensor? Looks like a torx drive bolt to take it out.

 

[MarcB]

no.1 - Knock sensor
no.2 - Oil pressure sensor
no.3 - Oil level sensor

 

[Reddish]

Cheers mate yeah number1 is smashed in half not even attached.