Service 4 wd light comes on as soon as I start to roll.Scan check reveals codes U0121,U2023,u1900,p1825,u0415.Took back in to rescan about a week later as per instructed by the mechanic ,but now it shows no codes but my service 4wd light is still on.Any ideas I might be able to look at.Any help would be appreciated.Thanks
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