Mercedes Benz C320 Computer

The Car Went Into Limp Mode, Wants To Stay In Park Unless Forced Into Gear. Several Error Messages, Abs, Etc., Came On. All This Happened At...

Took Emissions Test For The Fourth Time Monitors Reading Not Ready For Catalytic Converter, Oxygen And, Now Its Secondary Air.

The Scanner Goes Through Some Software Procedures But Then Tells Me I Have A Poor Connection Or Can't Communicate.