Jeff,
i was plaing with the 02 today. I connected the voltmeter to the after cat O2 sensor and getting reading of 0.35v only. I did not change when i started the car and it warmed up. I did not drive the car yes so can not tell if reading will change.
Is there any chance you could check the voltage from SIM? I think it is constant and can be checked as soon as car as started or ignition on.
Thanks a lot.
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97'vr4
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