What kind of scope you got there...is it analog or digital one? Is it Hameg, Textronix or some other manufactuer? As Stu said, give a shout and we'll arrange some pics for you how to proper set horizontal line (mS, uS or S) and vertical volt division line. I'm not sure what did you mean with lambda on the scope? Are you trying to hook-up the sonde to the lambda sensor, while car is running? In that way i prefer Ford WDS tester. http://www.fordscorpio.co.uk/images/fds2000.jpg