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Ist die FSE vielleicht eine mit integriertem Telematik-Modul?
Oder anders gefragt, brauchst du die FSE noch? Ich schätze, wenn du die abklemmst funktioniert alles wieder wie vorher.

Alternative ist, das FIS-Control im Navi-Modus laufen zu lassen und im RNS-E die "FIS-Control"-Option einzuschalten.

Vermutlich hast du in der Custom Firmware die Option "FIS-Control" aktiviert. Das ist im B7 nicht nötig bzw. sogar falsch. Diese Option ist nur zu aktivieren, wenn der Tacho keinen Telematik-Kanal hat.

Hi, the external sensor should not have any effect to the OBD communication.

I am really running out of ideas. Especially that you tell that the problems slowly bacame more frequent.

Where are you located? Maybe I could offer to send a replacement cable harness or even a FIS-Control box to you for testing. Just to find where the problem is.

Ok, so the FIS-Control does not connect to control module "17 INSTRUMENT CLUSTER" and also not to "01* ENGINE".

This is really strange, because I would expect that at least one of the connections work. The instrument cluster is connect via K-Line that is on socket B of the FIS-Control. And the engine control unit in your car uses CAN bus, that is on socket F of the FIS-Control.

Could you please check the wiring of your FIS-Control? Maybe you could take a picture of how the cables are plugged to the FIS-Control box.

Could you please connect VCDS to your engine control unit? In the upper left corner of VCDS, you will then see a info box with the diagnostic protocol. It is either "CAN" or "UDS".

Yes, but you have to select the "ENGINE" as the current control unit. You can do it at SETTINGS -> CONTROL UNIT.

Hi, wäre es nicht einfacher, das per VCDS zu codieren?
Sollte beim 8V doch gehen:
https://www.audirs3.de/threads/moeglich … ost-173281

As you told that it worked before, I could maybe think of a loose contact in the wiring harness.
The OBD connection is on Pin B1 of the FIS-Control (see here: https://fis-control.de/files/kabel.pdf)

Maybe you could look at the cable harness to check that none of the pins are broken. Or you could even check the connection with a multimeter.

Ok, then it should actually work.
Please double checke the following settings for your preset:
Control unit: 01 ENGINE (or maybe "01* ENGINE", if needed)
Group: 115
Value 4

And also in at SETTINGS -> BOOST:
Control unit: 01
Group: 115
Unit: Bar
Scale: Gauge

If you have a gasoline engine, you can find the boost pressure in group 115, value 4 in your engine control unit.

Ah, beliebter Fehler: Du hast im Preset 9 den "Wert" auf "1" gesetzt. Der Wert gibt aber an, welche Kollektion angezeigt werden soll. Also wenn du im Preset 9 die zweite Kollektion haben willst, musst du den Wert auf "2" stellen.