Get a DMM and warm up the car fully. Tap into the signal wire with a T-Pin.
You should be reading a voltage swing of at least 200-800 mv cycling about
7-8 tines in 10 seconds as you hold the engine at a steady 3000 rpm with no
load. If the voltage swings are lower in amplitude and slower than this,
your O2 sensor is bad.
It is best to only use genuine Nissan O2 sensors, especialy with the late
model 4 wire, 1995 and later obd2 cars.
Mike
> Well maybe you should test your O2 sensor before changing it, they usualy
> last at least 80,000 miles and they are expensive. Changing one that
>works
> well will not do anything. >>
>#1 how do you test the o2 sensor besides smelling the bad gas
>#2 i get my sensors from www.automedicsupply.com they are the BOSCH oem
>ones
>and they are really cheap.
>
>ANTHONY
>
>
>
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