If you search "black tank sensor" you will find tons of threads with a multitude of ideas on how to deal with it. Long story short, the sensors read from the top down, so if there is something stuck to the top (full) or next (3/4) sensor that is what it reads. Many of us just don't rely on them.
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2015 Bullet 220RBI
2019 Chevy Colorado extended cab V6 3.6 liter
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