So I grabbed a voltmeter and tried to test my o2 sensor. I ran the ground to the ground terminal of the battery and put the positive onto the white sensor wire. I'm not sure if I did it right but I put the voltmeter sensor into the white wire hole on the clip.

I let the car warm up and it read anywhere from as low as .063 up to .21. After four minutes, it still stayed within that range. I then tried to rev the motor around 2k with some help and the meter read the same.

Does this mean the sensor is bad? Never done this before.

 

Anyone

 

why are you checking the o2 sensor? is it throwing the o2 sensor cel? if it is just check your wires and if they look good then just replace the sensor no need to check it. if its throwing the cel is because is bad.

 

No CEL but having problems with emissions. I have replaced cap/rotor/oil and filter/plugs/wires and ran denatured alcohol, still can't pass.

Wanted to test o2 because people said to. Just checking to make sure I did it right.

 

it could also be your cat. converter...

 

cat was put on but it may be a bad cat.. was some $50 universal one

 

and not just that but a bad o2 sensor will ruin the cat aswell. so if youre going to plan on putting a new cat make sure you replace that o2 sensor first.

 

You need a new O2 sensor. Your oxygen sensor is failing to reach closed loop mode. Another test you can do is a resistance test.

 

weird there is no check engine light at all :\

 

Yes, that is weird. I compared your info with the info on my Haynes book and it indicates a faulty sensor. Have you tried the resistance test.

 

No I haven't but I don't know how to. I had a Haynes book myself but I cant locate it.

Do you think you could send me the instructions for a resistance test and the expective values returned on the meter?