The O2 sensors generate their own voltage through a chemical reaction at the tip. To test the voltage, warm up the engine, disconnect the sensor, connect the positive lead of your VOM to the signal lead form the O2 sensor and the negative to ground. Run the engine at 2000 RPM for around a minute or so. You should have .5 volts or more. If not, the O2 may be bad.
Next with your VOM still connected and the engine running, create a vacuum leak. The voltage should drop and fluctuate. If not, again the O2 may be bad. If it passes both of these, it should be good.
Right side O2 is the Passenger side.
Which air bipass code are you getting - if it's for the ISC (or IAB) then this could definitely be the cause of your idling problems.
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