Battery died and now my ohc reads -40 all the time. Does this mean my temp sensor is buggered?

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2005 fx4 level 2 ranger: ohc console, mustang dome light, aftermarket deck, hvac red, cluster red lighting, painted the interior, front bumper black, blacked out grill, red mesh behind grill, blacked out fender flares, HID conversion, cranked t-bars, rear emblem red, tow hooks red, rock guards red.