I have an SL 350 on an 04 plate,I have no idea what I have done wrong! I have been know on the odd occasion to run the petrol tank down quite low and two Friday's ago the engine light came on, I rang my trusty Merc garage and they told me to drop it in on the Monday; by Monday morning the light had gone out.. they told me no light no point in diagnostic as it would not show an thing. This Friday gone the same thing again, the engine coughed and spluttered and would not start, so I turned off and on again this time it sprang into life as normal, however the engine light was on again. I repeated the phone call, they said bring in Monday and we will stick it in the diagnostic machine thing... well I have just been out to take it to the garage and the light is off... again.... so I shall leave them a message explaining all.. So my question is... Have I sucked up crap into the injectors from running low on petrol also is it an easy job to sort out??? No... I know nothing about car engines... any feed back would be useful.