Have Mercedes Questions? Ask a Mechanic for Answers ASAP
Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.The code P0420 is in most cases caused by a failing catalytic converter on bank one . The code P0562 indicated a low voltage concern. I would have the converter checked first and while doing so have your charging system checked including the alternator to deal with these two codes. Because you say the car was hit in the rear end then I would also have all the mounts check as well as the drive axles. Either one can cause a vibration as well .