so you're saying that even if the ecu spits a code 55, the heated 02 testing with the solid light (no flickering) definitely indicates a malfunctioning sensor, correct? so if i need to leave tomorrow, can i just go to a local autozone and pick one up? if i can't, is it safe to drive long distances with only one operating 02 sensor? and lastly, how long do you need to disconnect the battery to reset the ecu? thanks again for your help.