You might consider making your own O2 simulator.
You could conduct an experiment by connecting an amp meter in series with the wires to the O2 probe and then take it for a test drive. While driving observe what the meter is reading during various driving conditions and record these values. Next, with the key switch in the on position, measure the voltage across the wires of the probe.
Take the measured voltage and divide it by the high and low current measurements. This will give your the resistance range of the O2 probe. From this value, select a resistive value in the middle for a starting point.
Buy a 1 to 3 watt resistor approximately close to this mid point value and disconnect the O2 probe and install the resistor in its place. Take a test drive and see how she runs. You may won't to vary the resistance value for best performance.
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