One problem related to steering has been reported for the 2003 Mercedes Benz ML320. The most recently reported issues are listed below.
Loss of power steering fluid, it appears to be from the hose connection to the radiator during driving and while stationery. This issue was previously recalled, I believe twice. Dealer requested $125 diagnostic charge. Mb USA informed in a phone conversation, that this problem was already fixed October 2008 under recall, and the warranty expired and I should fix on my own cost.