went into limp mode on low full. Refueled at station but now it wont crank over.

What is your question?

First off this is my 7th s class w220. So I know a little bit on this era. My kid bought a 2001 s 500 97,000 with only a half of gallon. Left used car dealership and in a 1/4 mi car into limp mode. As she pulled up at the station and parked it in front of pump. The tranny indicator and location of shifter went into park. But tranny stayed in reverse. She refueled car and it wont not turn over. They pushed over and parked it. So I took the shifter apart. Got it working again. But its still wont cranking over.It is getting the no run stasis. I can gain access to a MB Star 4 analyzer.But I never used one. Help