Have Mercedes 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.
You may have a fault with the ME (motor electronics computer/engine computer) as this can cause the fans to run on high as well as false coolant temp signals and other electrical issues.I would have the wiring checked for any shorts or damage leading to and at the ME and if found to be o.k. the ME itself may need replaced.It would need replaced with a new one and set up and programmed by a Mercedes dealer in order to operate properly in your vehicle.
This does need tested further to be sure this is the cause here.
If more help is needed, use the reply tab to continue our conversation. If no further assistance is needed, kindly rate my service.You can rate at any time and we can continue to work on your question as this will not close out your question.Keep in mind in some cases it can be difficult to fully diagnose or help repair your vehicle without seeing it and I work on delivering the best possible answer from what I see to work with.
Is there any way you can get the fault codes read out and post the code info here.You might be able to get a facility like auto zone to check them at no cost to you in some cases.Let me know if you can get this done as this will help here,having the codes gives us a starting point.
Is this a scan tool that is fully compatible with your vehicle that you are using for this here?
Some scan tools can only read the engine codes which is why you saw the misfire code but the scan tool is not able to read other computers to check codes for the ABS/BAS and other computers in your model.You want to make sure the scan tool that is used is one that can read all computers to then fully diagnose and locate the faults here.If you can get ahold of any codes set by all computers then post the code info here this will help for sure.