So I started to get this error a few days ago and had no choice but to drive it home instead of getting it towed. Ride was horrible! Anyways I noticed a few days ago that my drivers rear was sagging down a bit (Single axle air suspension system) so I started the car and it went back up. It’s been holding for a few days now but I’m wondering if it’s because I had a few bags of wood burning pellets which was unevenly distributed in the back seat causing it to sag on that side? I’ve since removed the bags from the back seat. Anyways due to rain I haven’t been able to go out and check leaks on the air bags but if it was leaking wouldn’t it be leaking and sagging daily? Or could it be my pump or sensors? I’m currently trying to track down ISTA software to check if it will give me more details on the error I’m getting but figured it can hurt to post and get some info from all the veterans here.

So needing anyone to confirm if its possible the airbags do have a small leak and maybe my pump has been working constantly without me knowing and if so is there a rebuild kit out there I can purchase? I looked at the recommended ECS Tuning kit but it appears it’s no longer sold. Could it be my sensors?

Thanks in advance

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2004 X5 4.4i 202k on odometer