Parking sensor

[philmanwho 0]

I have a malfunctioning parking sensor system. I can't get the old one out. 

 

I will replace both sensors but before I can do that I need help unplugging them. 

 

Has anyone down this before and if so, how do I remove the wire. I can see a grey clip which I have loosened, but the wire will not budge, am I missing another clip somewhere?

 

(Note, I did unscrew the sensor from the Bumper but that didn't helpe remove the wire.)

 

It's dark now, so I will upload a pic tomorrow if you require one.