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  #1  
Old 11-17-2020, 06:11 PM
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I have a gremlin in my air suspension.

I have the 2 axle suspension on my 2006 4.4i. I am having a odd problem.

1. Front end will lower to bottom end equally(no air in the front shocks.)
2. This can be in a couple of hours or may not occur for a couple of days.
3. It will lower evenly not one end or the other.
4. Rear stays in position.
5. When I activate it will raise front end with the reservoir or compressor to the correct position.
6. No faults or error message.
7. it basically operates as it should except for the front end lowering while parked.

I have the ista + and I have checked the following:

1. Raise and lower each shock. Works.
2. Check pressure, and tank for leaks works and correct.
3. Check level sensors , they work.
4. I checked every thing I could via ista+
5. I Removed cover and checked solenoid for leaks , none.
6. Check shocks and airlines for leaks , i could not find any.
7. I checked calibration and it is in range.

I thought if i had a leak in the shocks that one would lower, not both at the same rate. Both shocks were replaced by BMW with oem, 30,000 miles ago.
My x5 now has 83000 miles

I am stumped, anybody got any ideas??
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  #2  
Old 11-18-2020, 01:14 AM
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I had this same problem. I ended up ditching the air suspension for coilovers, but in inpa I did note I had a front level sensor "offset" issue. As an aside my auto leveling headlights would not work properly either. As soon as I reset the offset issue my headlights worked. Not sure the two are related, but I wouldn't be surprised if the reset wouldn't have fixed the air ride too. In the end I was tied of dealing with it.

Perhaps try the reset of the ride height sensors just for s's and g's?
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2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)


2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)
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  #3  
Old 11-18-2020, 01:23 PM
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I will try to reset the ride height sensors.
I will also run inpa instead of ISTA to get any other info.

It is baffling and is destroying my faith in this car. I would like just to find a broken part then replace it and go forward. This problem has been haunting me for a few months. Just in the last couple of weeks I was able to get a software set up to test it. ISTA does not show offset of sensors,not that I can find.

I can hear the air venting when I ask for a level change at the compressor. Is there a computer controlled exhaust valve at the compressor that could be malfunctioning also?

Gary
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Old 11-18-2020, 01:58 PM
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BTW, checking the sensors is done via one of the lighting modules. Can't remember if it's AHL, LKM, etc. But look in one of those modules. I had 3 offset values that made sense and one sensor's offset value was waaaaaay off.

I've read on the board that the offset value is important to reset when servicing the EHCII but as I said, I got tired of dealing with it and only reset the sensor after yanking the air gear while trying to fix my non-func auto leveling headlights. As soon as I reset the offsets the headlights worked again. Worth a shot for you anyway.
__________________
2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)


2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)
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  #5  
Old 11-23-2020, 12:17 AM
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Latest is that the front has not gone down in the last three days.

It did have a fault in the light level module that I cleared. It did not say what it was. I also reset the suspension module while on the ista.

The right front can be right on level or as much as a half an inch off. I think this may be a level sensor. I will check that tomorrow. Or maybe just order a new sensor.
So far crossing my fingers that it at least stays up.
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  #6  
Old 11-23-2020, 02:44 AM
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3 days is a good sign. Hope the reset is all it needed.

I'm pretty sure that's all mine needed but I was so frustrated one night I threw in the towel and ordered coilovers. This was before I got inpa and associated suite running so had never been able to reset the level sensors or the ehc2 module. Oh well.
__________________
2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)


2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)
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