Hi I have Mercedes model E320 CDI W210 model avant-garde the problems I have is the automatic transmission . Once I shift the gear lever pass Neutral , it won't shift back to reverse or Park, stuck at neutral at the highest position engine switched off only for it to go back in Reverse or Park , the car will drive but only in the low gear with no auto gear shift change. I did talk to a merc garage I was shocked at the parts and labour.Can you please advise me , Thank you