New to the forum, just purchased 03 320 w/61k miles, one owner very good condition, red battery lite came on(visit workshop), car then started jerking some and tranny slipped from drive to neutral all by itself..only happened after 150 mile trip, that is only symptom I have had...any thoughts..

 

How old is the battery? It may need to be replaced. Check the alternator output and the battery condition.

 

I found out that they replaced main battery at 40k miles, I took it to mercedes mechanic, he replaced the auxilary battery under the hood, seems to be better, thanks