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Re: O2 sensor draining battery?
IN any case, good or bad, the sensor is not supposed to be fed 12V with ignition OFF...so the actual location of the problem is somewhere else: THe fuel pump relay feeds the fuel pump and O2 sensor heater(s) using separate contacts. One contact is possibly shorted inside the fuel pump relay: try the amp test with the fuel pump relay removed.
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'93 Ponty Transport 3.8; 2011 SUzuki SX4 AWD (wife's) ; 2015 Sorento 2.4 AWD 1928 Graham Paige Model 629
I don't believe in miracles.
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