Wingroad MOST Bus Fault

That sounds rough! I had something similar happen on my old '14 Audi A4. The MMI just went kaput. Same symptoms: no audio, nav dead, and a bunch of error codes. Turns out, it was a faulty amplifier on the MOST bus. Those fiber optic networks can be a real pain when one thing goes down. Was the diagnostic tool specific about which control unit is throwing the error?

Thanks for the reply! No, the diagnostic tool just flagged the general MOST bus fault, not a specific module. How did you pinpoint the amplifier on your Audi? Did you just start swapping parts, or was there a more scientific way to figure it out?

I didn't just start throwing parts at it! I took it to a shop that specialized in German cars. They had some fancy equipment to test each component on the MOST bus. It's a serial bus network, so if one thing fails, it can take down the whole system. Honestly, with a general error like that, I'd recommend taking it to a shop with experience in car diagnostics and fiber optics. It’ll save you a headache in the long run. In the end it was the amplifier, and I remember it costing a pretty penny back then.

Thanks a lot for the advice! I was hoping to avoid the shop, but it sounds like I'm in over my head. I'll book it in this week. Got an estimate of about 1000€, so fingers crossed that will be it. Appreciate the help!