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-   -   Testing O2 Sensor (http://forums.pelicanparts.com/porsche-911-technical-forum/261636-testing-o2-sensor.html)

britt911 01-18-2006 09:08 AM
Testing O2 Sensor
 
My 86 Carerra is running unbelievably rich. Horrible gas mileage (even with my foot off the gas). I suspect the O2 sensor is going bad. Is there a way to test it before popping for a $220 test?

Thanks in advance
britt

stlrj 01-18-2006 10:30 AM
02 sensor will not make your engine run that rich but an easy test: unplug it and see if it makes a difference.

Joe

RickM 01-18-2006 10:38 AM
A Bosch generic replacement shouldn't be more than $60-$80. A search will yield lots more info.

Bill Verburg 01-18-2006 01:25 PM
Check the voltage there are 3 wires, black is the sensor signal which should fluctuate between 0.1 and 0.9 Vdc

If you connect in the harness it is the green wire.

Early_S_Man 01-18-2006 01:33 PM
Don't just hang any old meter or test lamp on that O2 sensor wire, either!!! The test instrument MUST have 10.0 Megohms or greater input impedance ...


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