The module itself was around $700. I have all of the tools and SW, but a reliable local shop was able to install and program for $150 (I work two jobs and just didn't have the time).

The way to know for sure is have your local shop guy hook up and watch the voltage readings live while bouncing each corner. You will see the voltage range for normal deflection. What I would see is the LF was out of range (pegged) on the voltage (even after the new sensor was installed).

The ride height deviation error is a direct result. The measurement is out of range and I believe the entire system is shut down as a protection mechanism. Just imagine the pump continuing to inflate the one that is out... Boom.

After reading all the threads (the flat tire monitor is another dead give away) and all of my own work I resigned myself to the module change. That issue has not been seen since, that was 5 months ago.

Good luck on resolving your problems.

Brent

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06 E53 4.8iS, born 8/2006 (wife's)
06 E60 M5 (mine)
01 330Ci Convertible (daughter's)