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What is the problem with may toyota vios 2007 model the check engine light on. on 2007 Toyota Corolla

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It has a diagnostic code of DTC PO141 Oxygen sensor heater circuit bank 1 sensor 2.I had already replaced the oxygen sensor I buy from Toyota.I reset the engine check by disconnecting the negative battery terminal but when i run the engine check engine light on again.What other things i need to check to clear the check engine light.Is there a fuse or relay connected to Oxygen sensor heater circuit?
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I have checked the heater circuit and there no 12 volts supply.I trace the 2 black wire and I find out that the ground wire has no signal. The ground wire is connected to the computer box.I have also checked all relay and fuses and all are good. Do you think there is a problem with my computer box.
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