Parking Sensor Failure

amwebby · 09-07-2008, 08:21 AM

After picking up my car from the body shop, when the installed a new bumper after my Waitrose knock, the parking sensors started behaving erratically, both red lights only coming on when I pulled away from rest. This was only intermittent and, when MB had it in to look at it, couldn't replicate the fault. All tests on the sensors showed them to be functioning normally.

Now, after a week of this intermittent behaviour, they've packed up completely, switching themselves off as shown by the light on the switch on the dashboard. Attempts to turn them back on from this switch just makes them beep loudly, turn both red lights on and turn themselves off again.

Has anyone else experienced this? I suspect a bad connection somewhere, are there any likely points?

carnut · 09-07-2008, 09:19 AM

I suspect one or more of the sensors have failed. This can be checked on a Star machine.

I had this symptom and the cause was one failed rear sensor

amwebby · 09-07-2008, 09:23 AM

That's what MB spent half a day doing. All sensors were allegedly OK. I suppose the one that took the knock may have been damaged and operating intermittently and has now failed. I hope that's all it is.

jaymanek · 09-07-2008, 11:09 AM

If they used the old ones they may have too much paint on making them think that there is an obstacle there..

BTB 500 · 09-07-2008, 11:13 AM

I had sensors acting erratically for a while after having a car valeted ... I suspect they'd used a jet wash and the sensors suffered some water ingress. They sorted themselves out though.

amwebby · 09-07-2008, 12:40 PM

Thanks everyone. As the sensors were working fine even after the knock this must be down to the repair work. I'm placing it in M-B Accident Management's hads. The extra hassle is annoying though, especially as it was showing up, albeit intermittently, when I picked it up.

amwebby · 10-07-2008, 05:54 PM

This is really getting annoying. Today the Parking Sensors started working again. Now they're back to failing inermittently. MB haven't phoned me back to book it in but I don't want to go through another round of them not being able to find the fault. What can I do?

greekCL · 10-07-2008, 06:19 PM

I would book it in and ... get a video clip replicating the problem, so I can show it to them, In case it does not replicate when you have it there ;-)

amwebby · 10-07-2008, 06:34 PM

Good idea. Now I just have to drive around with my mobile phone on video until it happens...

Did someone mention due care?

greekCL · 10-07-2008, 07:49 PM

Quote:

Originally Posted by amwebby

Good idea. Now I just have to drive around with my mobile phone on video until it happens...

Did someone mention due care?

Lol maybe get a passenger hehe

09-07-2008, 08:21 AM	#1
amwebby Hardcore MB Enthusiast Join Date: Aug 2006 Location: Thorpe Bay Car: CL500 Posts: 1,436	Parking Sensor Failure After picking up my car from the body shop, when the installed a new bumper after my Waitrose knock, the parking sensors started behaving erratically, both red lights only coming on when I pulled away from rest. This was only intermittent and, when MB had it in to look at it, couldn't replicate the fault. All tests on the sensors showed them to be functioning normally. Now, after a week of this intermittent behaviour, they've packed up completely, switching themselves off as shown by the light on the switch on the dashboard. Attempts to turn them back on from this switch just makes them beep loudly, turn both red lights on and turn themselves off again. Has anyone else experienced this? I suspect a bad connection somewhere, are there any likely points? __________________ Roger

09-07-2008, 09:23 AM	#3
amwebby Hardcore MB Enthusiast Threadstarter Join Date: Aug 2006 Location: Thorpe Bay Car: CL500 Posts: 1,436	That's what MB spent half a day doing. All sensors were allegedly OK. I suppose the one that took the knock may have been damaged and operating intermittently and has now failed. I hope that's all it is. Last edited by amwebby; 09-07-2008 at 09:36 AM.

09-07-2008, 11:09 AM	#4
jaymanek Hardcore MB Enthusiast Join Date: Nov 2002 Location: Nuneaton Warwickshire Car: 560 SEC AMG Widebody, 560 SEC AMG, W124 500E, W123 280CE, W123 200, R107-500SL Posts: 10,210	If they used the old ones they may have too much paint on making them think that there is an obstacle there.. __________________ Mercland is listed here on MBClub please click to see services and discounts available. 1969 280SL Pagoda in Met Light Blue 1980 123-200 in Sahara Yellow 1985 123-280CE in Champagne 1988 500SL in Met Light Blue Now with Leather 1988 560SEC AMG in Midnight Blue 1989 560SEC AMG Widebody 1989 190E 2.5 Cosworth Dogleg Manual 1993 E500 Brabus in Silver with lots of toys! 1 of 29 UK Supplied Cars Gallery Link

09-07-2008, 09:19 AM	#2
carnut Hardcore MB Enthusiast Join Date: Dec 2007 Location: Banbury Car: SL 350 Posts: 548	I suspect one or more of the sensors have failed. This can be checked on a Star machine. I had this symptom and the cause was one failed rear sensor

09-07-2008, 11:13 AM	#5
BTB 500 Hardcore MB Enthusiast Join Date: Aug 2005 Location: Bracknell, Berks Car: '97 R129 SL500, '07 Vito 120 Dualiner Long, '96 Audi A4 TDi 110 SE Avant Posts: 10,151	I had sensors acting erratically for a while after having a car valeted ... I suspect they'd used a jet wash and the sensors suffered some water ingress. They sorted themselves out though.

09-07-2008, 12:40 PM	#6
amwebby Hardcore MB Enthusiast Threadstarter Join Date: Aug 2006 Location: Thorpe Bay Car: CL500 Posts: 1,436	Thanks everyone. As the sensors were working fine even after the knock this must be down to the repair work. I'm placing it in M-B Accident Management's hads. The extra hassle is annoying though, especially as it was showing up, albeit intermittently, when I picked it up.

10-07-2008, 05:54 PM	#7
amwebby Hardcore MB Enthusiast Threadstarter Join Date: Aug 2006 Location: Thorpe Bay Car: CL500 Posts: 1,436	This is really getting annoying. Today the Parking Sensors started working again. Now they're back to failing inermittently. MB haven't phoned me back to book it in but I don't want to go through another round of them not being able to find the fault. What can I do?

10-07-2008, 06:19 PM	#8
greekCL Hardcore MB Enthusiast Join Date: Jun 2008 Location: North London Car: Mercedes CL500 (W215 2000) & Smart ForTwo Passion '03 Posts: 248	I would book it in and ... get a video clip replicating the problem, so I can show it to them, In case it does not replicate when you have it there ;-)

10-07-2008, 06:34 PM	#9
amwebby Hardcore MB Enthusiast Threadstarter Join Date: Aug 2006 Location: Thorpe Bay Car: CL500 Posts: 1,436	Good idea. Now I just have to drive around with my mobile phone on video until it happens... Did someone mention due care?

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