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Inspect your right rear air strut. I can bet the oil is leaking out of it...causing the knocking noise over bumps. Air bag itself is really well made on these struts. You would need to replace the air strut to fix it properly
How much should it cost to replace the air shock ? I was quoted by the Lexus dealer $1860. Too much ? I had thought you do both shocks, so that would be $3720.
There's remanufactured air struts available on ebay or oem air struts. Iv seen a few available new oem air struts available for around $700 - $800. You can have an experienced independent shop install these with no issues. Save some money compared to dealer