Citroen C5 rear suspension questions & problems

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Costin33
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Citroen C5 rear suspension questions & problems

Post by Costin33 »

Hello gentlemen,
I just bought my first C5 X7, a 2.2HDI tourer and I am very pleased with it.

But there is one problem. The back seems to stay lower than it should - looking at the distance between the tire and the fender in the front vs back, the difference is 2 fingers.

I went through and did calibration described by DiagBox, measuring H1M R1 etc, but I don’t think it changed much. I see almost no diff.

I found this video:
Where the guy actually adjusts the sensor on the sway bar - The problem is, I have no such sensor - and yes, I have the H3+.

Is the sensor supposed to be there and was something badly done by another mechanic? The car was imported from France and I have no service history

Rang the local Citroen dealer but they cannot help me until 2-3 weeks.
Thanks!
Kees
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Re: Citroen C5 rear suspension questions & problems

Post by Kees »

For sure you have this sensor! Other wise you get errors, and how do you want the car adjust the high?
Costin33
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Re: Citroen C5 rear suspension questions & problems

Post by Costin33 »

I will post a picture as soon as I get near the car. The housing where the sensor should be is empty for me.
Kees
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Re: Citroen C5 rear suspension questions & problems

Post by Kees »

You know, there is also a switch in the boot on the right side?
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GiveMeABreak
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Re: Citroen C5 rear suspension questions & problems

Post by GiveMeABreak »

Just be very careful about changing the position of the sensors under the vehicle - or the car can drop on you without warning! If you change these make sure the car is supported independently and secondly if you change the position here you may have worse problems. The rear always sits a little higher, and the Diagbox adjustments are only for small changes. If you have done the measurements correctly on flat ground with the tyres at the correct pressures, you should be able to check the values and use the reference values in Diagbox to check what they should be and make small corrections if needed.
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Marc
Kees
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Re: Citroen C5 rear suspension questions & problems

Post by Kees »

20240228_164722.jpg
I mean this one!
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GiveMeABreak
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Re: Citroen C5 rear suspension questions & problems

Post by GiveMeABreak »

But the car will return to normal position after this vehicle has been driven- and the OP would have to push the button to lower and raise the rear manually - so surely would of known he was doing this?
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Marc
Costin33
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Re: Citroen C5 rear suspension questions & problems

Post by Costin33 »

GiveMeABreak wrote: 28 Feb 2024, 16:47 Just be very careful about changing the position of the sensors under the vehicle - or the car can drop on you without warning! If you change these make sure the car is supported independently and secondly if you change the position here you may have worse problems. The rear always sits a little higher, and the Diagbox adjustments are only for small changes. If you have done the measurements correctly on flat ground with the tyres at the correct pressures, you should be able to check the values and use the reference values in Diagbox to check what they should be and make small corrections if needed.
The problem is my car sits lower in the rear that the front, a 2 finger difference. I am On my way! To the car as we speak and I will post pictures.

Thank you for your responses 🙏🏻
Costin33
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Re: Citroen C5 rear suspension questions & problems

Post by Costin33 »

Costin33
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Re: Citroen C5 rear suspension questions & problems

Post by Costin33 »

Here is a video of whats under the car:
Kees
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Re: Citroen C5 rear suspension questions & problems

Post by Kees »

So, it seems you're right, very strange!!
I think you have to remove the plastic box, to see if the connector for the sensor is still there and ask Marc for the parts and numbers you missing.
Success,

Kees.
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GiveMeABreak
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Re: Citroen C5 rear suspension questions & problems

Post by GiveMeABreak »

I'm surprised the suspension is even working as without data from the height sensors the suspension ECU will throw a fault and you will get the warning up on the dash.

Whatever you do, don't get under the car without jacks.

Has it rusted and fallen off?
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Marc
Kees
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Re: Citroen C5 rear suspension questions & problems

Post by Kees »

Hi, Marc.
I think if the sensor is still there and connected, diagbox will show the error, but you get not a warning on the dashboard.
But still it's very strange, that the connecting parts are removed.
Greetings,
Kees.
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GiveMeABreak
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Re: Citroen C5 rear suspension questions & problems

Post by GiveMeABreak »

You will get a warning Kees, as I've had it loads of times. Sometimes the suspension will not lower or raise, directional headlights will not work (static mode backup only), suspension warning and max speed will sometimes appear too.

All these issues are when the data from the height corrector (s) are missing or don't make sense. The height correctors are only analogue.

So this is an entirely new one on me - unless something has been changed in Diagbox or steel spring conversion has taken place! :-D
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Marc
Costin33
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Re: Citroen C5 rear suspension questions & problems

Post by Costin33 »

It still has its spheres.
I can rise, lower, adjust the height however i may like. There are no errors, even in diagbox.
I dont know if a conversion was done, since this is how i bought the car 😢.

I dont know what to do to fix this