Multi-Factor Authentication Issues: Troubleshooting Guide

Hello (my Touran 2005, 1.9 TDI, 77 kW, 147,000 km).
While driving on the highway, after having refueled about 500 km earlier, the multi-function display suddenly showed a faint red warning light without any specific information. The fuel gauge, temperature indicator, speedometer, and tachometer were still working.
Nach Spannungs Kontrolle der Batterie vorsichtshalber ohne den Motor auszumachen , ( 13,9 V )bin ich dann weitergefahren und habe erst am Zielort (Samstag keine Werkstätten offen) ausgemacht. Uff. Starts up again.
"AI system failed? I need to check the error logs. I'm located near the North Sea."

Disconnecting the battery for just 2 minutes wouldn't hurt and is worth a try.

Haha, after this latest restart, everything is suddenly working again!

Aber warum? Thermischer Fehler im Display? Power supply?
Normally, it's deactivated; it only becomes active when you turn the ignition on.

Please also check the connectors at the back of the AI unit!

Okay, thank you, Rainer. When I'm back home, I'll open it up and take a look. If necessary, I might also try using some cold spray or applying heat to see if that helps.
As long as it's working again, I wouldn't take it to a workshop around here – otherwise, it will end up costing you a fortune.

Hi, maybe it was just the result of a voltage drop?
I was driving on the highway when I suddenly heard a strange engine noise, which sounded like an engine running sound being transmitted to the body of the car. I stopped and found that a screw from the KKR (likely referring to a specific component) tensioner had come loose and was resting against the right side of the engine compartment, causing it to rub. I noticed it because the noise changed when I turned the steering wheel or pressed the accelerator! The engine was tilted to the right! Significantly.
So, I tightened that silly screw at home, and the noise was gone!
Yesterday, when I was pulling out of the garage, I suddenly heard a noise again, but it was different – louder and more urgent.
Immediately stopped and found that the ribbed belt was only half attached to the pulley for the air conditioning compressor.
Okay, so far I've found a faulty lamp and a loose pulley on the alternator, as well as some debris and wear.
The free-running mechanism could be shifted laterally by 1-2 cm on the fixed sleeve.
So, it's completely worn out now. Today I temporarily installed a rigid piece of glass so that I can drive tomorrow.
Could the AI failure have simply been a consequence of undervoltage?
While I was checking the voltage on the road, the motor might have been temporarily blocked, causing the alternator to spin along with it?
The loose tensioner bolt may have simply come undone due to the rattling of the faulty freewheel mechanism.

...is probably a turkey disease .

Okay, I'm ready. Please provide the German text you want me to translate into English. I will only provide the translation.

Autoservice wrote:

...is probably a turkey disease

.
Okay, and what's different about this compared to a Golf or an A4?

Quote:

Okay, and what's different about that compared to a Golf or an A4?

"Good question - I've experienced this complete failure of the freewheel mechanism three times on my Touran, while with the others, I haven't had any total failures yet - they just got stuck."