my CEL came on but im not sure if its the O2 sensor. So i wanna take it out and look and see if its worn out. does any one know how a worn sensor looks like compared to a good one??? and if its out, where should i get one...typical auto store or an OEM one?? thanks...

 

A trip to your nearest AutoZone (hopefully when they are not too busy) will answer your question. There are many things that will make a Check Engine Light go on, The ozygen sensor is only one of them. The friendly AZ man will put the tester on your Civic and tell you why the light is on, hopefully.

 

https://www.hondacivicforum.com/m_152006/tm.htm

little DIY on checking your CEL