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Rear parking sensor removal
#1
Hi. Does anyone know how to remove a rear parking sensor? Can it be replaced without removing the bumper?.


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#2
I think they are very hard to get to with the bumper on. I had to do them on my BMW and never needed to on the B9, but it looks tight up behind there, try getting your hand up, if you can feel the sensors rear end then perhaps by feel you could do it.

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2012 B9 HDi van
2007 M59 HDi van
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#3
It does look like a pig of a job. I've seen people pop the sensors out from the front, would be good if this was the case.

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#4
The issue I had with that, was yes, the sensor can (and does) come out of the front, but the plug and cable are too short to put back on in that way. You need to have your hand behind to reattach the sensor to the harness.

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#5
Cheers. Looks like that's my job for tomorrow evening

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#6
The quickest way to get 'em out is to reverse gently into a low wall.  Don't ask my wife how she found this out - she will tell you that I had turned off the sensing function!!!  Rolleyes

Had to get a couple of replacement holders that the actual sensors sit in which clip into the holes in the bumper.  A bit fiddley but not too difficult if you like lying down! Big Grin
B9 (2016) 1.6 BlueHDi 100 Multispace XTR = Mine;   B9 (2013) Enterprise 1.6 HDi Van = Hers.
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#7
Luckily I didn't need the wife's help.
Turns out you can get to them from behind the bumper, without taking it off.
All the sensors look to be fine so I think it's the ecu.
I've seen a few on EBay that look the same, would it need reprogramming if I buy one?
[Image: 4638433eb1b7a1bc2d64a93e58c3f027.jpg][Image: 43e8bca824ed0f6c0e5f4ad0f2d65215.jpg]

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#8
(28-06-2022, 05:39 PM)Cooper Wrote:  . . . All the sensors look to be fine so I think it's the ecu.

What exactly is the problem with the system, are you getting any beeps or other noises out of it when you select reverse gear?

.
My vehicle .... 2006 (m59) Berlingo Multispace Desire - 1.6 HDI 92 
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#9
I get a beep and then the Parking assistance system faulty message appears.

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#10
The sensors emit ultrasonic waves so there's no way you can tell if any of them are working, without watching live data from the parking assist ECU in Diagbox. Good sensors look exactly the same as bad ones to the human eye. You could buy an ECU of the exact same part number and it still not work.

One sensor gone bad, is enough to stop it working completely. The ECU won't need coding but you're fishing in the dark and may replace it all before you ever know what part was wrong.

Diagnostics/ live data using Citroen Diagbox is the only way you're going to know.

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