So you have run a diagnostic test on your LandRover because you have the suspension light of death on. But what does the c1a00 code need you to do ?
The most common fix is simply to reset / adapt suspension settings, to adapt and reset the dynamic suspension settings you will need LandRover sdd or a similar dealer spec diagnostic tool that is capable or changing / adapting and resetting diagnostic values.
Generic obd code readers will not be able to solve this issue !!! Main dealer LandRover sdd or similar is required.