hi, just wondering how would you tell if your o2 sensor on a OBD-1 car is not working? Im pertty sure it wont throw any codes but can what are some ways to tell/test it to see if its working.

Cheers

 

I believe one logical symptom would be that it runs rich or lean for a really long time.. Because the Block Learn/Fuel Trim numbers change according to the O2S. And if the O2S is slow to respond or doesn't respond, the Fuel Trim numbers won't change..

 

Any specific tests?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tianporn &raquo;</TD></TR><TR><TD CLASS="quote">... o2 sensor on a OBD-1 car is not working?</TD></TR></TABLE>That's code #1. But I think it has to be real bad, not marginal.

Voltmeter while it's plugged in & running... It should oscillate quickly around 0.5volts. An oscilloscope would be good, but some voltmeters are fast enough to see the fluctuations.

 

ya i can smell gas from inside the car..could it be o2 sensor issues?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vmm &raquo;</TD></TR><TR><TD CLASS="quote">ya i can smell gas from inside the car..could it be o2 sensor issues?</TD></TR></TABLE>That can be 50 different things, but O2 sensor isn't the first thing to my mind...

 

my second o2s is broken on my car but its odb2, the check engine light is on

 

fix it dood

 

Say if I unplugged the o2 sensor and drove the car around the the car runs absolutely **** then would that mean my o2 sensor is fine. But if it runs the same can I conclude the o2 sensor is broken?