Excuse my ignorance of this has already been answered, but I tried searching and only found changes from 2018 to 2019 regarding adaptive suspension.
I have a MY2018 but not sure how to tell if I have adaptive suspension. Any easy way to tell without getting under the car? I’m looking into getting springs or coilovers so I’m not sure which options are right for me.

 

They all have adaptive suspension

 

All model years have adaptive suspension, but Lexus made tweaks/improvements in the form of adding Yamaha dampers, changing control arms, etc. to improve ride quality. I changed my springs to RS-R Ti2000 to lower the ride height, but also to retain the AVS functionality when switching the different drive modes. You can also retain AVS now with RS-R's newer I-active coilovers - but not sure if they're out yet. You'd have to reach out to them or ask Mike Forsyth.

 

Somewhat related, in my research for all things LC since I'm working towards convincing the wife my life is about half over and I need it, it appears that the LC has ride height sensors that look very similar to air suspension height sensors and links. I'm a bit of a tinkerer so I'm wondering if anyone has tried adjusting the links or replacing them if they are fixed? Long shot it seems like, but figured I'd ask.

 

Just curious, you're referring to adjusting the links to adjust the ride height? If so, I don't think that'll work, since the LC doesn't have air suspension. The ride height sensors would be for the headlights I presume - so they point at the correct level....