Mercedes E Klasse Electrical Problems

That sounds incredibly frustrating. I remember similar software issues a few years back with my old Audi A6. It wasn't a Mercedes, but the symptoms sound eerily familiar: random error codes, electrical quirks, and the infotainment system acting strangely. In my case, the issue stemmed from a corrupted software installation to the main control module. Have you tried a simple software reset to see if that clears the errors and gets the system back on track? Also, is your mechanic sure it's just a programming issue? Sometimes these things can be caused by a failing sensor that's feeding bad data to the control unit, causing it to fail.

Thanks for the reply! A software reset sounds promising. Could you elaborate on how you performed that reset on your Audi? Was it something you could do yourself, or did it require specialized equipment? And regarding the sensors, I'll definitely ask my mechanic to double-check those. Which sensors were problematic in your case? Maybe that will give him a starting point.

On my Audi, the software reset required diagnostic software that could access the car's computer systems. I wasn't able to do it myself, so I had to take it to a workshop. They basically reflashed the control module with the latest software version. As for the sensors, I had issues with the MAF sensor, which was causing all sorts of weird readings. I would recommend your mechanic checks all relevant sensors. Since you say you have errors in the error memory, he should easily be able to pin down faulty sensors via diagnostic software. If it turns out to be a faulty sensor, the cost for a new one is usually significantly less than a new control module. If that does not help, I'd say have the programming of the control unit checked. Good luck and keep us posted!

Just wanted to give you a massive thank you for your advice! I spoke with my mechanic, and he checked all the sensors, but they appeared to be functioning correctly. He then proceeded with the control unit reflash, and, thankfully, it resolved all the issues! The error codes are gone, the electrical system is behaving, and the navigation system is back online. The 240€ stung a little less knowing it was money well spent. Thanks again for sharing your experience; it really helped guide me in the right direction!