I had similar problem last week after driving 200 km the tank was just a quarter full. It looked like I wasn't going to make it to the next gas station 150k km away. I "barely" made it bsed on the 'Range' on the cluster and when I filled up the tank I was able to put only 23L so the sensor was sending the wrong info to the cluster. After filling up it was ok but I get the same error as cabrio when scanning. No issues since.

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4.8is 2004 imola red
4.8is 2005 Black on Black - DINAN/2 sold
4.4 2004 X5
2003 330xi
2008 328xi - sold
4.4 2000 X5 - sold