I pulled the tank out and found that the low level sensor (bottom of tank) had 10k ohms resistance across the leads, but the high level sensor (top of tank) was an open circuit (infinite resistance) across the leads. You want 10 k ohms resistance across the leads of both sensors when the tank is empty.

I spliced/soldered a 10k ohm resistor across the leads of the high level sensor. I then shrink wrapped the resistor and wires, reinstalled the tank, and the check engine light turned off. That was 5 months ago - still no issue.

You could probably do the same thing without removing the tank as the leads to both sensors are accessible and visible at the bottom of the tank.

Definitely worth it to avoid paying the $1300+ for a new tank!