we have mercedes w204 diesel .steering lock problem .the car didnt start even no light in the cluster .faults codes are [1]the electric steering lock has a mulfuction.there is an implausible signal.[2]the electric steering lock has a mulfuction.there is a mechanical fault.when we disconect and conect the plug on steering lock it works ok.is there any repair issue that we can repair this proplem ? .thanks