Fuel gauge not working properly

2004 AUDI A4
102,000 MILES
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The won't go past 3/4 when the tank is full. I pulled fuses 15 and 28 then turned on the ignition to reset the gauge. However that didn't work. Any ideas as to what else to try?
Apr 10, 2013 at 6:34 PM
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KASEKENNY
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More then likely this is the fuel level sensor has failed. This a sensor that changes resistance level based on how much fuel is in the tank. So when it fails it does not give the correct readings so the gauge is wrong.

I am attaching below the testing that we need to do in order to figure this out.

Here is a guide that will help with this type of testing as well:

https://www.2carpros.com/articles/how-to-check-wiring

Also, here is the process on how to replace the sensor if this proves out to be the issue. Please review this below and let us know if there are questions. Thanks
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Dec 18, 2020 at 7:29 AM