Reset the error and the pump should kick in. The problem is the pump is weak and not able to increase pressure in the reservoirs. You'll probably need to get the refurb kit from bagpipingandy.

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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