how to wire secondo 2 sensor

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Junior Member
what's up I need help ....

I have a 97 hatch with a 98 obd 2 gsr in it with the gsr ecu

I need to know where to wire the second o2 sensor to on the ecu its the only code I have I have found threads saying a5 d13 and d14 but I dnt know where the 4th one goes please help