Blue wire in engine bay to sensor?

tomNZmazda

Member
:
Mazda Familia 1.5
Hi,

changing the oil in my car, aware of a bit of a leak from the pressure switch - but it might actually be from whatever is above it - but not sure what that is.
Picture shows view from ground underneath the car facing to the sky.

mazda_blue_wire.jpg

The pressure switch has the light coloured wire going to it, but the blue wire is as yet unidentified?

Can anyone help?

Thanks
 
I think (hard to tell exactly from angle) that is your knock sensor. If you do unscrew it, there's not an oil or coolant passage, it just screws into block. I replaced mine because the back of it, which is made of some type of silicone, melted or just disintegrated down the block like what yours seems to be doing.

Edit: looking at it closer, I'm certain, that it is the knock sensor. It looked like the blue wire was part of the nut/stud on the intake manifold due to the angle. But zooming in, it looks like your knock sensor.
 
Last edited:
Back