Hi some advice would be welcome please. I have a 2002 W220 that runs extremely well but when the ambient temperature rises to around the 30 deg mark as it has in the last week or so it occasionally cuts out whilst accelerating and the warning lights on the dash say "Major Failure-visit workshop". Stopping the car and turning off the ignition resets everything and you can carry on as normal. This happened last summer too and I took it to my local MB dealer who did a Star diagnosis but they said the fault was non specific and suggested replacing components. Anybody got any better ideas?