i have a 2003 eclipse gts and i want to know exactly how many o2 sensors are on it? thanks

 

you have 2 O2 sensors. One located before the Cat and one after the Cat.

If you are experiencing issues with the car then most likely its the upstream (before the cat) O2 sensor that is the problem since that is the one that controls fuel output. If you simply have a CEL and dont really notice any issues, then its most likely the downstream (after the cat) that is the problem since all that one does is monitor that the Cat and emmission system is working correctly.

 

i know that but i want to know how many upstream o2 sensors i have, i have one on each header but i'm curious to know if there is also one right before the cat. i'm pretty sure mine is cali emissions since it's the gts and some people have said that there are 4 o2 sensors all together.

 

Asumming the gts is a v6 you should have at least 2 upstream o2 sensors. They are both gonna be located before the cat.