Update!
Lexus back from the mechanic.
Two new airbags and a new sensor, bit pricey but sooooo worth it!
Thrilled to have my car back!
Thanks for your help!

 

I missed it, which ones did you end up replacing? Rears or fronts? How much better is the ride quality now?
My rears are old af and dying, still hold air but the ride sucks on some roads with vibration entering the cabin making sometimes loud noises...it's time...