Anyone know how to replace the O2 sensor on a '90 Crx Si ..(SOCH)?
Thanks in advande for the help..

 

Yea, get an o2 sensor socket from autozone, and then get a breaker bar and a cheater, and then bust it off. They are hard as hell to get off if its been on for a while. Would work if you had a impact wrench too, but may be hard to get too. They are on the exhaust manifold if you didnt know already...

 

that is a way to remove the O2 sensor, but not really the right way. What happens when you do that (sometimes) is when the sensor finally breaks loose, it rips the threads out of the manifold, thus leaving you screwed when you can't install a new sensor.

Heres what you do, spray some type of penetrating lubricant into the area where the threads meet the manifold, not too much, you don't want it getting all over the tip of the sensor incase its still good Second, start the car and let it run for about 5 minutes. the heat causes the metal to expand a little making it easier to break the sensor loose. BE CAREFUL not to burn yourself on the manifold. Get the socket mentioned in an earlier post and it shouldn't be too hard to break loose. Wehn you install the new sensor, if the threads on the new one don't already have some anti sieze compound on them, put some It looks kinda shiny grey AZ sells this as well. Remember an O2 sensor is pretty delicate, try not to touch, or get oil or grease on the tip of the sensor. It measures millivolts so anything can distort its ability to give accurate readings.

Hope this helps
Chris

 

buy an o2 sensor removal socket (about $12) i believe its a 7/8" socket. (even tho its a honda all o2 sensors use sae). if you dont use o2 socket, use a 7/8" wrench