The car isnt a thirdgen but it should still apply...its a Nissan Maxima and i am thinking the o2 sensor is bad. Im investigating this a lot because the o2 sensor is 100 bucks(i miss the cheap parts for my firebird ). My question is, the voltage(with motor at operating temp) should go from low to high very rapidly, right? i hooked up a voltmeter to the signal wire and it read ~.245 and didnt change. Is this a pretty good sign its a bad o2?

Thanks!

------------------
~Sp33d~
(sold)1989 2.8l 5-speed RedBird w/ flowmaster, cold air intake, TRW cam. Audio system includes-Cadence component plate 4x6's/Cadence 3way 6x9's,300watt amp to front speakers/400watt to Blaupunkt DVC 12" sub.

 

don't have any manuals for you car or one even one handy that has that info in it, but i believe you should see more than your ~.245. and it should change, not stay at one reading. now we'll get someone on here that works for a nissan dealer and shoot holes in my reply

------------------
-=ICON MOTORSPORTS=-
1st & 3rd

 

Foo,

If you have a zirconia-element oxygen sensor like most REAL cars, there is a bias voltage that is applied to the sensor whenever the ignition is on. This raises the signal level of the sensor to a more useable and "cleaner" value so that the signal isn't completely lost by the time it gets to the ECM.

If the Nissan scheme uses a titania-element sensor, you're on your own. The element changes resistance and exhaust oxygen is measured that way instead of the voltage-generation of the zirconia sensor.

My guess is that if the voltage doesn't change in either case, the sensor or its connections are fragged.

------------------
Later,
Vader
------------------
"No matter how hard you try you can't stop us now"
Adobe Acrobat Reader 4.0