Hi guys i have a 53 plate 1.6 zetec focus 3 door in trying to find a few engine problems i have noticed that the knock sensor on the engine has the wire from the sensor going to the dipstick tube but then doesn't plug into anything, does anyone know if this correct as i could not see any stray plugs for it to plug into ?, only asked as car is pinking badly under load, thanks for your help