Audi A4 8E: Parts, Repair & Info

Translated on 31-07-2026, 16:56.

Hello everyone,
I have a question... Specifically, on this S4 B6, there are no K and L lines at the diagnostic connector. Instead, we have bl/sw on pin 1, brown on pins 4 & 5, and CAN on pins 6 & 14. I don't know what the rest of the pins are right now. But I always thought that all B6 models had these K and L lines!

"Additionally, I'm unable to access the diagnostic system with one of my testers. It's not detecting any control units. However, using a ScanGauge2, I can query real-time data via the CAN bus and clear error codes from the engine control unit."
I don't understand! Why doesn't it work with the ScanGauge and the Audi diagnostic tools? (I've obviously tried several).
Could it be because the complete Vehicle Identification Number (VIN) isn't yet entered in the car's system? (That could also explain why the airbag light is on after 10 minutes.)
HELP!

Translated on 31-07-2026, 16:57.

No VIN = no car?

"Why is the VIN missing? That would definitely make me worry..."

Translated on 31-07-2026, 16:58.

I know why that is

.

Okay, so the tester is checking the combination instrument (which acts as a gateway) via the diagnostic CAN bus and isn't detecting a valid VIN.

"Does Scangauge matter?"

Sure, here's the translation:

"Is that correct?"

Translated on 31-07-2026, 16:59.

http://wiki.ross-tech.com/wiki/index.php/01794

Permanent problem solution: Replace the combination instrument.

Best regards, Rainer.