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Old 05-05-2002, 05:30 PM
Arthur Dalton Arthur Dalton is offline
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Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,784
Seeing that you have the sensor out, you may want to try this. It is not as good as testing the system in the car, but will tell you if your sensor is generating a signal and cycling...
I can't see if you have a 3 or 4 wire sens in your pic,,, but if it is 4 the ground is the gray wire . If 3 , the case is ground [- neg..]
The 2 white are heater and you may want to see if you have continuity there while you are at it.

Any O2 sensor that will generate 0.9 volts or more when heated, show 0.1 volts or less within one second of flame removal, and pass the two minute heat test is good regardless of age. When replacing a sensor, don't miss the opportunity to use the test above on the replacement. This will calibrate your evaluation skills and save you money in the future. There is almost always no benefit in replacing an oxygen sensor that is good.

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