Originally Posted by wraub
I have seen a large number of O2 sensor questions on this site and was wondering how to tell if it's bad. I know that the O2 sensor closest to the manifold has a lot to do with mileage. I just replaced the cracked manifold on my wrangler, now it runs a lot better but now I am wondering if I need to replace my O2 sensor. Another question I have on the O2 sensor is, who makes the best. Its pretty hard these days when you go to Auto Zone or any other Auto parts store and yo have several different options to choose from. One may cost $30.00 the next may be double. so how do you know which one to get. These days with the price of gas as high as it is if I can increase my MPG why not? Or if anyone else out there has any other suggestions on increasing MPG I would really like to here from you. All replies are greatly appreciated. Thanks...Ed
Why not go to any emissions test center?
I know apple auto glass runs tests, they can easily tell you the exact numbers your looking for.