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hi. just fitted after market parking sensors today.
managed to do this without removing the bumper. this is how idid it.
first I drilled acurately into the bumper the holes for the sensors to go into.
underneath the bumper I undid the studs, then I put the middle two sensors in
and dropped the wires down inside the car. I took the grummitts out of the lower tailgate panel then dropped electrical wire through and eased the bumper away at the bottom to allow the electrical and sensor wires to drop through. then I tied the electrical wire to the sensor wire and gently pulled them back through the grummitt holes, taking care not to snag them and damage the contacts. behind the corner sensor holes is the body work of the car on the one corner behind the jack and the other corner behind the gunk suff. I then drilled with a 3/8 th metal drill through the sensor holes and pushed the wiring through into the car .the wiring was easily routed round the back. I sealed with silicon the corner holes and rubber grummitts the centre holes. this was certainly better then taking the bumper off and only took me half hour.
I hope this info helps anyone who is dreading taking the bumper off (I was)
the sensors I used are cisbo and they are working as well as on my MGZT factory fitted ones.
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