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Message: <blockquote data-quote="525i" data-source="post: 647199" data-attributes="member: 103">That indicates that your air suspension has a leak and is no longer working as it should. Look at the car from the back. Do you notice that it is leaning on one side? Our X5 uses air springs and after some years they can wear off and leak. Causing it to no longer able to maintain the car to be level. Some X5 has only the rear air springs (2) While some has both front and rear. (4) problem could be that the air compressor used to pump up the air spring could be gone as well. This compressor is located underneath the spare tyre. There is no special button and it is not related to the engine issue (O2 sensor) Get your mechanic to check on this as a car without suspension is quite dangerous to drive. Especially our heavy X5.</blockquote>