Getting the suspension error message and tpms together indicates the car is sitting lower than it's programmed to do. I believe there is a maximum allowed difference in height between each corner before triggering the tmps (don't know how much) but if you measure the height of each corner you'd know which one is the lowest. That's assuming it is physical...it could also be a faulty sensor tricking the car into believing it's sitting too low.

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BMW X5 E53, 4.8iS - 2005
Professional Stereo/Nav with DSP (modified BM54 module) - Converted to Eonon GA5166X with Reverse cam
4-Corner Air Suspension - Converted to BC Coilovers