There are 2. upstream and downstream. they require a special tool(slotted socket that allows removal without breaking wire connection. Very easy though. just unscrew and remove, just dont break wire connection.
The oxygen sensors are screwed into the exhaust on either side of the catalytic converter.
follow the exhaust
CHECK YOUR SPEEDS SENSORS, FIRST THEN MODULES AND WIRING
I wouldn't replace it, just fix it. Check heatertreater.net for information on how.
The best way to find out if you have any recalls is to call the dealer with the VIN number and have them check. The are required to check for you.
Check the label on the drivers door jamb, it will list original size and recommended pressure.
The fuse, if not, then the switch, then the motor, but by then you will also need a test light and/or a DMM.
Check this page out, and look at related articles. http://autorepair.about.com/library/faqs/bl903h.htm
Check the abs sensor on the rear axel first and then the sensors on the front wheels. All of the sensors are rather expensive to replace. This is pretty much a dealer fix.
CHECK YOUR SPEEDS SENSORS, FIRST THEN MODULES AND WIRING
Check: Autotrader.com KBB.com Nada.com
It depends if it is a California emissions model. If it is not there should be 2 O2 sensors. One before and one after the cat. converted. If it is a Cali emissions model then there are most likely 4 O2 sensors. Two before the 2 mini cat. converters and 2 downstream of the cat converters. The check engine error codes will tell you which bank and sensor number. I have a Grand Cherokee limited 2004 Cali model and there are 4 O2 sensors. The link (in realted links sections) will show you where the o2 sensors are located and how to change them.
You can not reset your oxygen sensors. You can only replace them. To reset the check engine light you will have to get that done by a repair shop with a computor. If replacing the sensors does not repair the problem then check for a vacuum leak.
replace the o2 sensors should do it.
I wouldn't replace it, just fix it. Check heatertreater.net for information on how.
Check the front brake sensors. Replace them if they are worn out. Make sure you get the correct front brake sensors.
start by changing the tranny fluid and filter. if that doesnt work, check the input and out put sensors. next try adding lucus tranny fix. from there might need a rebuild... GL
Trace it or replace it
Check conections on the o2 sensors . Replace the 02 sensor.