First, fill to overflow, then drain for quite a while. This would be to "wash off" the top sensor window. If that doesn't work, try to find the three thin wires coming from the tank. They represent 1/3, 2/3 and full. The "full" wire could be inadvertently grounded somewhere. These are very tiny, fragile wires, and are often haphazardly installed without much protection. A nail, staple or screw could have easily pierced one.
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Marty and Martha
2015 Z-1 211RD
2012 Nissan Titan
Dalzell SC
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