BenzWorld Junior Member
Date registered: Jul 2018
Vehicle: 2007 GL450
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So after inspecting the level sensors and finding nothing obviously wrong with them, I bought a compressor as my next step. To my surprise, that did in fact turn out to be the problem. I'll now perform a full leak check to ensure I'm not leaking anywhere, but otherwise I should be good to go.
One weird thing though: the voltages for my level sensors are now all back in line with where they should be, i.e. around 2.0 V. I'm not sure how a failed compressor could cause these voltages to go weird, but it no longer seems to be an issue.
I hope this thread helps others in the future.