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Use a digital volt meter to determine the pin arrangement. On the new sensor, Two will be from the heater in the sensor. Set the meter to low OHMS and probe two wires at a time till you get 3.0-5.5 ohms(1.6l TFI engines) or 10.0-15.0 ohms in 1.6L MFI engines. That's the heating element circuit wires that will be connected to the voltage and ground from the ECM. The other wires are the sensor ground, and the sensor output.

This may help, my OEM O2 sensor pigtail is as follows-

blue=sensor ground

white=sensor output

blacks=+B (voltage from ECM) and Heater Ground, it should not matter which

With the key off, disconnect the O2 connnector from the harness near the firewall. Turn key to "on" position without starting car. Set volt meter to 10 or 20 volt DC range. ground black (-)neg. probe to engine and probe connector at the harnesss with the positive lead to find (+b) 12v from the ECM.

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