Air Suspension Problem

[Gregory891]

For EPDM, the rear air bag system has a ride height sensor at each rear wheel. Diagnostic software will tell you which corner (I had this). They are cheap enough that you could replace both.

[Gregory891]

For Madwelschman, the most likely problem (software can help) is an air leak in one of the struts. Given the age of the car, it’s likely “time” (been there myself). Replace them in pairs, as the other corner is just as old. Arnott suspension exchange units are an economical way to fix this.

[Madwelshman]

Thanks
Would I not see the car drop if they were leaking?

[Gregory891]

Leaks can occur in the folds and “hold” when the car is static. Air suspension systems are great, I like mine (rear only in my case) but time, pressure and usage will naturally bring them to the end of use. If they lasted 14 years, that’s quite long.

[LVR]

I had plausibility errors.....have a look at the ride height offsets... (circled in red below)



The value is out of range which meant it worked until you drove or parked over something out of level and it gets confused again.

this happened to me and using INPA I reset only that corner bit by bit to bring it back within range...

[Madwelshman]

I had this and replaced the regulator rod because it was stiff, I was thinking it was putting excess load on the sensor arm, when I checked the readings after I had 0 on three wheels and 1 on the front left. Before hand it would go to -1945.
May have to borrow my friends snap on unit again as I do not have inpa program

[EPDM]

Originally Posted by Gregory891

For EPDM, the rear air bag system has a ride height sensor at each rear wheel. Diagnostic software will tell you which corner (I had this). They are cheap enough that you could replace both.

Ok will do thx! Finally have some time to get this sorted...

[Madwelshman]

Does anyone know what causes active plausibility, this has now come up after going around a roundabout, reset the code and it did it again two days later and once again going around a corner.

Getting to the point I want to blow it up 🔨🔨🔨🔨🔨🔨

[syncrocrick]

On the same topic...my "Suspension Inactive Fault" light came in for the first time last week for the first time. 2003 e53 175000 miles 4.4 Sport.



The interesting thing is that it was a very windy wind and I have a Thule box on top. I could feel the wind pushing the truck really hard. Then I stopped at my destination and the light never came back again.



I kind of wonder what happened...

[EODguy]

Originally Posted by Madwelshman

Does anyone know what causes active plausibility, this has now come up after going around a roundabout, reset the code and it did it again two days later and once again going around a corner.



Getting to the point I want to blow it up

Possibly ride height sensor overrides on curve yet has come back to the correct position afterwards and system is confused as to temp position earlier...

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