2000 LX470 200k - Bought this a few months ago... AHC had worked N and H, never would go to LO. Stopped working a few weeks ago. Pulled C1713 and C1762. We flushed the fluid - mine had green/black fluid, some had turned to green gooey slime in the reservoir. We pulled a ton of whitish precipitate from the fluid we bled (see pics). Used 3 L at first. The front started working, pulled no codes after I cleared them. We flushed an additional 2L via MityVac (pulling 10-15lb) we were able to pull more crud from the rear and accumulator. Then we found the rear sensor bracket was busted - no sign of hitting anything and nothing else was bent or broken. Welded it up, put it back and the AHC is working, but appears to be in some type of limp mode. Still pulling C1713. May take the sensor apart and clean, see if that clears it up.
