Have Mercedes Questions? Ask a Mechanic for Answers ASAP
Hello Vivian, my name is***** you for the question. It sounds like you may have a catalytic problem with the exhaust. If there is a failure it will cause the exhaust to make certain noises which is what you may be experiencing. It can also be a valve timing issue, but more of the time there will be engine noise associated with this also. If the check engine light is on then it should be scanned for codes as that will assist in knowing what the problem may be. I hope this helps. If you need further assistance please let me know.
It possibly can be, but most of the time that will just cause a lack of power and not a strange noise coming from the exhaust.
The catalytic converter needs to be checked to see if it is clogged. If it is then it needs to be replaced.
No problem. If you need anything else please let me know. Please rate when you can also. Thank you and have a great night.