williamsdiesels.com he did my start error, im in Bradford, il tell you what he told me. but a wsp, its a black box that he replaced behind the dash, then he hooked up the computer, got a code out, got a code in, programmed the black wsp, cut me another key (bonus ha ha) and put the dash back together. my cost £275 to williamsdiesels £168 mercedes for wsp. what i will say, is that i looked at a ecu wsp replacement for £200 from ebay, but iv read too many horror stories breakin down, same problem, start error, recovery etc. im a carpenter and need reliability, and quick turn around.
Phone call on the tuesday to williams, fixed by friday.... on my doorstep...
Mercedes wanted 8-10 days to fix, £87 recovery, £56 diagnosis and my time not working... £150 before i even sneeze.
All the best
trev m, January 2010