O2 Sensors, How do i know when they are bad? Options

[sapperk]

Any one know how i can tell if my O2 sensors are bad? My car idles like crap at low speeds, and jerks. I tried almost every other thing and according to troule shooting its the O2 sensors. But they are expensive, so does anyone know?

Also are both O2 sensors the same. Top and bottom?

[juBz86]

ok so i replace the o2 sensor in the exhaust manifold with a bosch universal one because they said it was only one that came up on their computers at pepboys. i checked the haynes manual and it only shows one o2 sensor being replaced. wtf!!?!?!

and the check engine sign still came on!!!!! is it supposed to happen? i ended up disconnecting the battery and i'll see if there is an improvement in gas mileage.


edit:
the code that came up when i got it checked was 27. and the book says its the sub-oxygen sensor - open or short circuit. that sensor is only for cali. my car wasnt from cali and i just looked to make sure i didnt have one.

This post has been edited by juBz86: May 25, 2005 - 5:56 PM