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Hi if your air suspension has logged an fault in the air suspension, then the system will lock and usually lower to the bump stops, Unfortunately there is no way to clear this fault with out a T4 diagnostic computer which is what the dealers use.
As for cost on just clearing the fault, this will vary depending on the labor rates for repair shops in your area, but the typical charge is about 1 hour.
Let me know if you need anything clarified or have a concern that I did not cover.