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so in my car, as soon as i get the "fuel low" warning, the fuel level indicator drops to 0. it's a pretty consistent repro, and the car does still have fuel, but is not reporting it.

my initial guess is that the fuel level sensor is bad. a few questions:
1. should i try to use the "techron" fuel system cleaner?
2. would the L or R fuel sensor need to be checked?
3. any other issue that may cause this?

the car drives fine.

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Old 05-06-2014, 04:50 PM
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You didn't mention what vehicle you have. You could have one or two sending units. You may have an issue with it, you can remove the sender and test it. Monitor the resistance as you move the float. Resistance should decrease when moving toward full. Of course, this is without knowing what vehicle you have.

- Nick
Old 05-06-2014, 04:50 PM
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Thanks for your reply! Apologies for not posting the model details.

This is on a 2008, 328i (E90).

Would monitoring the levels using option 6 on the "hidden" OBC menu also indicate something?

Since it happens consistently, my guess is that the reading is "always" bad (for one of the sending units - as you mentioned). So if I see the same value for the L or R values even after driving around a bit, we know which one it is.
Old 05-06-2014, 05:09 PM
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just a quick update, after monitoring the obc fuel levels, it seems like both sensors are working - they change values as i drive around.

the next question is, when it reports 'empty' which sensor is not sending the correct reading.
Old 05-07-2014, 11:26 AM
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