For the third time this year I've noticed my car not sitting level. Upon noticing this I put the calibration blocks in the bump stops and both times one sensor (different corners each time) was much lower than the other side. Disconnecting the sensor shows that the pins have some green corrosion on them on both the male/height sensor side and the female/body side. I can clean it and that will fix the reading but doesn't solve the root of the problem of why this keeps happening.

Since my car is an early car with the later style height sensors I have a short harness that connects between the height sensor connector and the body connector in the wheel well (see here for a picture of the harness). I assume the problem is something to do with the quality of this harness and the sealing of the connector not being quite right.

Has anyone else had this problem? The only thing I can think to do is to remake the short harness myself with new good quality connectors and pins unless anyone has any better ideas?

Not that I'd ever recommend an actual bodge... but a Short Term Remedy might include some self amalgamating tape, or even heat shrink?

Self amalgamating tape is used on antenna connections on mobile phone masts so should be well up to the job of keeping any moisture out of the height sensor connections. Or if you really want to seal them, Denso tape is even better, horrible stuff to work with though.