S-Class (W221) 2007-2013: S 320 CDI, S 350, S 450, S 500, S 550, S 420 CDI, S 600

S600 - Random Rodeo Movement

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Old Apr 10, 2023 | 04:45 AM
  #26  
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Originally Posted by V12mrinc
Yes! Exactly right!

which part is correct?

1) under the parcel self / speaker grille - as in on top of the right rear strut mount?

or

2) behind the passenger side backseat means, in the space between the rear firewall and the back of the right rear seat backrest (not up on the parcel shelf)?
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Old Apr 10, 2023 | 07:44 AM
  #27  
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Originally Posted by BOTUS
which part is correct?

1) under the parcel self / speaker grille - as in on top of the right rear strut mount?

or

2) behind the passenger side backseat means, in the space between the rear firewall and the back of the right rear seat backrest (not up on the parcel shelf)?
​​​​​

#1 However I had to remove the passenger backseat to access which is why I described it as “behind the passenger side backseat…” because there’s no access from the trunk (at least I didn’t see a way to)

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Old Apr 10, 2023 | 02:53 PM
  #28  
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I thought on an airmatic pdf it shows you can pull up a bit of trim behind the headrest... but I couldn't find it to confirm
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Old Apr 10, 2023 | 03:32 PM
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Originally Posted by BOTUS
I thought on an airmatic pdf it shows you can pull up a bit of trim behind the headrest... but I couldn't find it to confirm
My V12 has ABC (hydraulic fluid) suspension not airmatic so not sure if the location is identical but if indeed there’s a way to avoid the hassle of removing the rear passenger seat in the S600 model w/ABC please share as this will be a much better option for anyone undertaking this in the future!



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Old Apr 11, 2023 | 04:29 PM
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Originally Posted by BOTUS
I thought on an airmatic pdf it shows you can pull up a bit of trim behind the headrest... but I couldn't find it to confirm
I know that is possible to remove the long speaker cover easily:




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Old Apr 14, 2023 | 01:37 PM
  #31  
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Originally Posted by George993
Random rodeo is usually due to Acceleration Suspension Vertical Sensor 0045423518 (291786049640). About $25 and about 5 minutes to replace - two bolts and one plug around the top of front shock tower.

Those are not ride height sensors. Ride height sensors are in the wheel wells. When they go bad or loose (worth checking the bolts) they typically create more of a single "jump" instead of a "rodeo".
I just replaced all 4 ride height sensors and I had an odd thing happen twice today, once while rolling and once while at a stop light. The right passenger side seemed to suddenly lower maybe an inch without provocation. I had a passenger in the car who felt the same thing.

Could this be the Acceleration Suspension Vertical Sensor that you mention above? My car is a 2008 S63.

Also, MBUSA has an updated part number and indicates that there are 4 sensors for my car (one on each corner): https://mbparts.mbusa.com/oem-parts/...g-unit-9056502
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Old Apr 14, 2023 | 03:31 PM
  #32  
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Originally Posted by CQHall
I just replaced all 4 ride height sensors and I had an odd thing happen twice today, once while rolling and once while at a stop light. The right passenger side seemed to suddenly lower maybe an inch without provocation. I had a passenger in the car who felt the same thing.

Could this be the Acceleration Suspension Vertical Sensor that you mention above? My car is a 2008 S63.

Also, MBUSA has an updated part number and indicates that there are 4 sensors for my car (one on each corner): https://mbparts.mbusa.com/oem-parts/...g-unit-9056502
sounds very similar to how my issues started but the movement gets worse and eventually turned into an all out mini rodeo at stop lights and a few times even on the highway going 70+ (very unnerving)

Now the problem is completely gone and for less than 10 minutes of work and less than $70 bucks!

Everyone with a V12 should consider just swapping these sensors out if you’re over 100K mi for new ones in my opinion and especially if you start showing symptoms of intermittent suspension movement!


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Old Apr 14, 2023 | 09:37 PM
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Originally Posted by V12mrinc
sounds very similar to how my issues started but the movement gets worse and eventually turned into an all out mini rodeo at stop lights and a few times even on the highway going 70+ (very unnerving)

Now the problem is completely gone and for less than 10 minutes of work and less than $70 bucks!

Everyone with a V12 should consider just swapping these sensors out if you’re over 100K mi for new ones in my opinion and especially if you start showing symptoms of intermittent suspension movement!
Roger that. Thanks!

BTW, my car only has 75K miles. I think it's a function of time as much as mileage.

How many sensors did you change out? 3 or 4? You have ABC, not Airmatic, right?
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Old Apr 14, 2023 | 10:19 PM
  #34  
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Originally Posted by CQHall
Roger that. Thanks!

BTW, my car only has 75K miles. I think it's a function of time as much as mileage.

How many sensors did you change out? 3 or 4? You have ABC, not Airmatic, right?
Yeah I changed out 3 (2 under the hood ‘one on each shock tower and 1 behind the rear passenger hatshelf)

Changing the ones under the hood immediately fixed the issue. I just changed the one in the rear as preventative maintenance.

The ones under the hood literally took a minute to swap out!
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Old Apr 15, 2023 | 04:53 AM
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metallurgy and age fatigue - mileage is irrelevant

we see it in all the rubber suspension bushes and on many sensors - they invented copper wire just fragile enough to last 7 years of normal operating conditions (as that's a typical stop point in global legislation, where the law gives up on "luxury goods"), if lucky it can reach 11 years

its a great idea - if you know and can reach the sensors, its a cheapish fix - but to many without advanced diagnostics and or great forums, its nasty warning light, odd vehicle behaviour, failed roadworthiness tests, and rather than costly dealer fixes most go in a skip and they get to sell a new car. the other win is for markets where legislation is stronger or you are building a reputation for your emerging market brand - you just bolt on the longer lasting iteration of the sensor (Russian build toyotas are better made and last longe than any other ...)

Its a total myth electronics can only last 18 months in an average laptop - voyager is still going 55 years after they built it and a few billion miles....

ABS sensors all drop at the same tine, crank position sensors do the same, and now these - there is no need they fail ever, they have no moving parts !!!!!
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Old Apr 15, 2023 | 07:38 PM
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I replaced the two sensors on the shock towers under the hood. As stated above, easy-peasy.

Now I need to learn if there is only one sensor for the rear or two, then order them.
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Old Apr 15, 2023 | 09:32 PM
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Originally Posted by CQHall
I replaced the two sensors on the shock towers under the hood. As stated above, easy-peasy.

Now I need to learn if there is only one sensor for the rear or two, then order them.
There should only be one but at the price point you can’t go wrong getting 2 just in case!

Also, if you don’t mind please let us know if you notice the problem resolved over the next few days please.

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