Does anyone have a good diagram/description of where the O2 sensors are located on a bone stock 2002 Civic Si? (K20A3) I need to replace the O2 sensors and would like to do it myself and not have to pay to have it done. Any help would be greatly appreciated!

 

just follow your exhaust there should be 2 of them i believe..... one before the cat and one after they are the only sensors pluged into the exhaust

 

will do - thanks!

 

do you know how to remove them?????

 

follow the exhaust, find the sensors (like said before, one in the cat, one in the exhaust), un-clip the harness, if the o2 sensor is bad you can use some wd-40 or PB Blaster to loosen it up, use an open ended wrench, clean off any spray you used to help get the sensor out, as it might damage the new sensor, install the o2 sensor, clip the harness, reset the ECU by removing the negative terminal for 5 minutes, should be good to go.

 

most off the time you have to heat it up either with a small torch or just run the car for a little while but be careful becasue it is HOT when doing this. but this is the easiest way i've found to do.