Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received 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 fault codes need cleared out with a fully compatible scan tool then the engine ran and check and see which codes come back again.This may be an issue with the engine wiring harness as I have seen before on some models needing repaired or replaced.
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Disconnecting the battery wont clear the codes on this model here.You have to have them cleared out with a scan tool that can communicate with all computers.You may also need the idle learn re learned now that the battery was disconnected as this can wipe out the idle learn causing a surge or rpm/idle issues.It is possible that the engine ECU is faulty but I would have the codes cleared with a scan tool then the idle relearned with the scan tool and see what codes come back from there as well if the idle is corrected and let me know if this is o.k. with you.
O.k.,let me know what you come up with here when your ready.
If you can clear out the fault codes this will help.I have seen in some cases where one or more codes may not be at fault here and clearing them out will help isolate which codes are setting for this fault here.
Is there no communication to any computers on your model here?
O.k.,this is a difficult question for me to be able to answer fully from here myself but others here may be able to assist further on this.
I will open your question up for others here to see if someone else can assist further on this as there may be others here that may have more info on what to check or do with this issue.I hope you can get this resolved with ease.No need to reply to my last post here unless it is a last resort as it will keep your question locked to me and others will not be able to view it.If you feel you want to continue to work with me on this feel free to reply at any time but keep in mind in some cases it can be difficult to fully diagnose or help repair this without seeing your vehicle.