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Have to agree with everything Art says. If you really want to check that sensors abilities you need an oscilloscope and a propane enrichment kit. You need to see that it can reach .9 volts and drop down to .1, you need to know that it can go from low to high in 100 milliseconds or less and you need to see one full cycle, low to hig and back to low, in 300 milliseconds or less. With the scope hooked up you need to feed it a little (damn little or it will stall) propane and watch the voltage peg, then keeping it pegged shut off the gas and see how fast it drops to .1 and then snap the throttle and watch how fast it goes from low to high, this is where you need to see a time frame of less than 100 milliseconds. This is, more or less, the approved method for checking O2 sensors for the state of California.

Mark