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

2008 w221 air malfunction after hose replacement

Old Jun 28, 2023 | 05:28 PM
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2008 Mercedes S550
2008 w221 air malfunction after hose replacement

have an 08 s550 (obviously)

hose snapped during fog light repair ,im assuming age of line.
after it was fixed im still getting the car up arrow , car raises and lowers.

i notced roght side looks lower, tested with fingers and def 1 less finger height on passenger rear tire not as bad at passenger front.

what are the chances of either a shock or level sensor going out at same time?

also is there a definite way to tell if a shock is bad or leaking?

parts arent bad for either but i wont want to just throw parts at it.

would a true mb star diag be the only way to know for sure??

\
\thanks in advance
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Old Jun 28, 2023 | 05:32 PM
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Lift up the front end with a floor jack. If you have a bad strut in the rear, that side will drop all the way down due to the other struts not being able to compensate for it.
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Old Jun 28, 2023 | 05:59 PM
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ok sounds good so once the front is up it should get even lower?


pass rear

side

after raising car
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Old Jun 28, 2023 | 06:21 PM
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Originally Posted by Bebe9803
ok sounds good so once the front is up it should get even lower?
Yeah, when you lose a strut, the other 3 compensate for it so you can get home. Since it can't support weight on its own, raising the front end will drop the bad one in the rear to its bumpstop. It's just a quick way to verify. Ideally, you should hook up to a diagnostic computer and test the pressures so you can see which part failed.
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Old Jun 28, 2023 | 06:25 PM
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do they make a scraping sound as well when they "bottom out"?

over some harder bumps i hear a slight scrape for a split second
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Old Jun 29, 2023 | 12:34 AM
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Originally Posted by Bebe9803
do they make a scraping sound as well when they "bottom out"?

over some harder bumps i hear a slight scrape for a split second
No but a broken level sensor bracket would make a scraping noise.
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Old Jun 29, 2023 | 07:48 AM
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its runs stupid close - if you deflect a bump stop or a suspension bush I can imagine it scrapes - you should NEVER drive it when dropped - it damages stuff - allegedly can destroy the struts air bag
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Old Jun 29, 2023 | 07:51 AM
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there's at least another 2" to do down before this is bottomed...

Originally Posted by Bebe9803


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Old Jun 29, 2023 | 11:59 AM
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Originally Posted by BOTUS
there's at least another 2" to do down before this is bottomed...
so is this most likely the level sensor between the dropping and the sound?
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Old Jun 29, 2023 | 01:09 PM
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see the other post - remote car diagnostics isn't a done deal - it can only be guess work

and the less we know about the cars history and its owners knowledge in what he tells us and the tech background / skills they have - the less accurate we get
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Old Jun 29, 2023 | 03:55 PM
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Just scan the module for codes.
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Old Jun 29, 2023 | 05:17 PM
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Originally Posted by kevm14
Just scan the module for codes.
There are no codes to help other than if an electrical component failed or the compressor timed out. The OP says the car raises and lowers. This means the compressor, control valves and level sensor all work.

His problem is a leak, either in the strut or the air tubing.



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Old Jun 29, 2023 | 05:30 PM
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Originally Posted by Shadly1
Yeah, when you lose a strut, the other 3 compensate for it so you can get home. Since it can't support weight on its own, raising the front end will drop the bad one in the rear to its bumpstop. It's just a quick way to verify. Ideally, you should hook up to a diagnostic computer and test the pressures so you can see which part failed.
When a strut goes out the other three do not compensate for it. Broken strut will fall all the way down raising the opposing corner on the other axle.

There us no pressure to test. System has one pressure sensor in the air tank, WHICH IS NOT THE PRESSURE IN THE STRUTS.

Pressure in struts comes from the weight of the car floating on the struts, which is less pressure than what the air tank has.
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Old Jun 29, 2023 | 08:02 PM
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Originally Posted by Arrie
When a strut goes out the other three do not compensate for it. Broken strut will fall all the way down raising the opposing corner on the other axle.

There us no pressure to test. System has one pressure sensor in the air tank, WHICH IS NOT THE PRESSURE IN THE STRUTS.

Pressure in struts comes from the weight of the car floating on the struts, which is less pressure than what the air tank has.
This is incorrect. I can pull individual pressures and from each strut. I can also pull a pressure reading from the reservoir, which is completely separate. I can raise and lower each individual strut. The other 3 struts WILL compensate because the ride height will be reduced at one corner. If your airmatic system isn't operating in this manner, it's broken.
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Old Jun 30, 2023 | 08:17 AM
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When you get that symbol (car with the up arrow) it means there is a code in the suspension module.
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Old Jul 1, 2023 | 05:22 PM
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Originally Posted by kevm14
When you get that symbol (car with the up arrow) it means there is a code in the suspension module.
Will regular odbc work?
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Old Jul 1, 2023 | 05:24 PM
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No
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Old Jul 1, 2023 | 05:37 PM
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If you don't want to pony up for the laptop based stuff, you can get an iCarsoft MBII. I carry one in the car. It gives you a good place to start with diagnosis but it doesn't do everything.
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Old Jul 1, 2023 | 05:38 PM
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Originally Posted by Shadly1
If you don't want to pony up for the laptop based stuff, you can get an iCarsoft MBII. I carry one in the car. It gives you a good place to start with diagnosis but it doesn't do everything.
What are the laptop route options?
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Old Jul 1, 2023 | 05:39 PM
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I recommend getting the V 3.0 because it seems to be more capable than the previous model. I have both.
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Old Jul 1, 2023 | 05:45 PM
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Originally Posted by Bebe9803
What are the laptop route options?
Dedicated laptop, XENTRY/DAS software, OBDII Multiplexer, lots of learning curve.
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Old Jul 1, 2023 | 05:49 PM
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Originally Posted by kevm14
I recommend getting the V 3.0 because it seems to be more capable than the previous model. I have both.
I didn't know this came out. I just read about it a little. That's awesome! Actuation tests? Is that real? Any idea if it can code a new module or update firmware?
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Old Jul 1, 2023 | 05:54 PM
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I actually haven't tried the 3.0 on my S550. I bought it because my MBII wouldn't talk to the ECM on my 2014 E63 (nor a 2017 C43). Just no comms. I tried updating it and got no help from iCarSoft either....

The 3.0 won't update modules and I am sure some bidirectional features don't work right but I liked the idea because the MBII didn't support any bidirectional at all.
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