On a 2008 E320 Bluetec, other than using an OBD, is there a way to know which of the two sending unit inside the fuel tank is not working?
My dashboard fuel gauge is not showing how much fuel is there in the tank and according to my searches can be one of the two sending units not working but the OBD is showing me nothing about it.
The two units are identified as: Left and Right.
Any idea about this?
Thanks.

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Nyck - TX - USA

You will need a diagnostic computer of some sort. Something that can pull real time data.

ICarSoft should be able to do this. These are about $150 on the ubiquitous e-commerce site with free Prime delivery.

There are several Android apps that pair with a cheap Bluetooth dongle that may be able to access the data as well. I know LegitStreetCars on YouTube has promoted this on some of his videos.

Also try AmazingRoadTV he’s a Russian guy but he subtitles in English. He also promotes a diagnostic solution on his channel as well.

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech