Hey what's going on guys I just bought a 1991 civic dx hatch with the stock d15b2 motor and I wanted to replace the o2 sensors on it but I don't know exactly where they are. I know it's a noob question lol but can someone tell me where they're located?

 

The O2 sensor is at the right front side of the engine.

 

Thank you so much! so there's only one?

 

Only one.

 

Thanks again. I also noticed that I need a new catalytic converter and I came across this http://m.ebay.com/itm/For-88-00-Honda-Civic-EG-EK-High-Flow-Racing-Straight-Test-Pipe-CAT-Converter-/361192395908?nav=SEARCH is it worth it??