I have a 2001 Nissan Sentra GXE 1.8L with 66,000 miles on it. I had trouble with the engine stalling whenever I pushed the clutch in, even if I was travelling down the road and not at a stop sign, etc. I bought a code reader and got codes for both o2 sensors and a couple EGR codes.
I have a relative who works at the nearby Nissan Plant in Canton, MS , so he said to bring it there to let their techs look at it. They replaced both O2 sensors and the EGR after I ordered and brought them the parts.
The car isn't stalling now, but it is still throwing codes (O2 sensors.) The techs there told me the catalytic convertor will need to be replaced also.
So, my question is "How hard is it to replace a cat conv yourself?" I have basic auto knowledge, ie. oil changes, coolant flushes, replace alternator, replace brake pads, etc. Can I do this myself?

 

changing a cat is as easy as changing 4 bolts. but the cat shouldnt fail after only 66,000 miles. usually when a cat dies that quikly its because you are running too rich and there is gas getting into it and clogging it up. the best thing to do is buy an aftermarket freeflow design and just have a muffler shop do it, they usually dont charge to much if you bring them the cat yourself.