Great thread! I've been dealing with the dreaded sag in my rear drivers side for a little over a year now. Sometimes it wont sag for days other times in just a few hours or over night.

It sounds like the best way to troubleshoot a bag vs the sensor would be to jack up that corner, remove wheel, support the axle on a jack stand (to get some pressure on the bag) and spray some soapy foam water?

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E70 / F30 / UZJ100