Air suspension issue

Peter_Bull · Aug 26, 2023

I noticed yesterday and toady that my suspension has lowered from the 'normal' setting overnight. Switching on the engine and pressing the air suspension switch to raise it says the following:

It then takes about a minute, flashing all the time, before it then raises the car to 'normal' and stays there with no fault message at all.

Recently I applied Lanoguard ( an under body protection ) and wondered if some had got near the mechanism that could cause this.

Am I doing something wrong or could it be an issue that needs investigating. TIA.

vitesse · Aug 29, 2023

No experience with Porsche air suspension but on my current & previous BMW530DSE with rear air suspension,ride height is controlled by small height control units linking the rear wishbone each side with the suspension cross member subframe-these are basically an encapsulated potentiometer feeding a signal to the ride height control module which then activates the compressor control & valves as necessary.My
BMW doesn't have cabin control of the height although you can code the required height by acessing the system.
Many BMW height problems are normally down to these lever arm units which can just be replaced with new ones .I've fitted adjustable versions which allow me to "kid" the computer into lowering the rear suspension as I couldn't recode it as I wanted.
So maybe those on your Cayenne have possibly got gummed up with underseal but with your background ,I don't see it,really.
Connection to a reader would probably tell you the fault.Sorry can't help any better.

Peter_Bull · Aug 30, 2023

Thanks Colin, I appreciate your comments and advice.

The Lanoguard is not very thick at all, but it appears effective. Looking at the various 'levers' they don't look at all gummed up. but ............... !!

It raises up OK each morning and stays up all day, so the system is working fine just losing pressure overnight. There is obviously an air leak in the system and all four corners go down. It does look quite sexy that way though [

]

I have it booked into a garage in a couple of weeks so hopefully they can find it and fix it under warranty.

Graham-S · Aug 30, 2023

Hi Peter

I know on the 955/957 there is a repair kit for the compressor as the O rings get old and Tired.
As it's all 4 corners go down I would think it's a compressor leak. There are 4 outputs from the compressor on the 955/957 so one pipe per bag.
Not sure what model you have. Compressor was located under the under the drivers Seat with some plastic trim over it if your feeling DIY
From your picture the Arrows are pointing down so where you trying to lower?
Note: Can't operate the Air Suspension with any door open, Safety Feature

Graham