Howdy all,
2005 RX300 SE-L 80k
Thought I'd post this in case it helps anyone out - Considering a new height sensor is about 300 quid, I thought I'd open up my faulty one and see what laid within before shelling out.
Although I had no warning lights etc., the car was riding really harshly and kangarooing at the back from the tiniest bump, so something was clearly amiss..
Consulting my ebayed workshop manual: Straightened out paper clip connecting pins 4 and 13 on the OBDII port starts diagnostic mode (quite fun as it opens up a diag screen on the satnav which is interesting to play with).. The 'OFF' light for the air suspension flashes out code 14 telling me that the LH rear sensor is faulty.
Took about 10 mins to take it off and test its resistance according to the chart - Mins was in the 100's of Kohms, so manual recommends replacement. Nothing to lose at this point, so opened it up and found that it's a pretty rudimentary bit of kit, with some steel springs that carry the signal (apparently via some black conductive paint on the lid)
As you can see, it was all pretty rusty in there (and wet with WD40 in these pics!) So, I cleaned everything up, gave the springs a rubdown with some emery paper (If you do this, be careful when you take the lid off - Don't, as I did, let them ping out and have to spend half an hour trying to find one of them!) Do, however, pull them out and clean up the area where they sit into the base - I think this is where mine was losing connection.
Anyhoo, cleanup, reassemble, check resistance (all good now) and put it back on the car - All back to wafty floatiness !! If I ignore the spring-finding time, it probably took and hour in total and cost me... errrm.. nothing. Well worth a bash if you have height sensor trouble..