Hi Mark, as with most WSP units the info gets wiped thru spiking, due to jump starting, rather than send ecu and wsp etc away, we at williamsdiesels.com reccomend when you see start error that you order a WSP UNIT STRAIGHT AWAY FROM MERCEDES, takes 3 days, first you will pay no diagnosis fee, 2nd you will cut down time. williamsdiesels.com will travel anywhere in england to programme your new WSP using the official Mercedes Benz Star Diagnostic Computer. All we ask is that prior to us attending you have either a new battery or a fully charged battery. Our charge is £275 anywhere in England. All details are at williamsdiesels.com
Dean Williams, April 2009