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I too had a problem with idle and gas consumption (from 22 avg down to 13.5mpg and my o2 read up to .9 volt). After many months and many test, finally I got it fixed. In my case (M104 engine though) I don't have the 12 Volt to heat the o2 and another signs that point me to believe my ECM is bad (car is running though).
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until I did the o2 sensor test and found no 12 V for heater coil which led to another more test.
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Test 2: The heater circuit is working. Hooked it up to my 12V battery /w amp meter inline....After about 30seconds the O2 sensor was too hot to touch.
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As George560sel wrote, check that you have 12 volts being supplied to the O2 sensor with the car running. Your tests have only proven that the heater in the O2 sensor works when supplied with 12 volt source, not that the O2 sensor is being supplied by the ECM with 12v source necessary to operate the O2 sensor's heating element. Mark