yeah im curious about that also,how many do our cars have?

 

You should have a minimum of 2 O2 sensors. Basically you get the special sensor socket (It has a notch in the side for the wires) and take out the sensor take a look at it wipe it of with a clean rag make sure there's no particles stuck anywhere. Then put it back in.

 

can't you use carb cleaner and a soft brush to clean the 02 as well? I got a cel and the o2 sensor in bank one is bbelow threshold.