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The 89 car would have been OBD0. To run the D15Z1 you need the proper ECU which is the P07. Is this what you have installed?
The O2 sensor circuit is very simple. If you get an O2 code it's the sensor, the wiring, or the ECU. If you have the correct VX P07 ECU, I would next check the wiring. If you used the stock 89 harness you needed to add extra wires for the O2 sensor. Verify they are connected to the proper locations on the ECU by looking at an ECU pinout. If the wiring is correct, the ECU is correct, it's your O2 sensor. Being new doesn't mean it's 100% guaranteed to work. Which brand is it? Did you get the proper O2 sensor?
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