Not sure what else i need to do so maybe someone else does????

Its a P0420 o2 crap. im on stock downpipe atm and have ams high flow which i believe is the problem?

Already used and o2 extender and made triple sure its not leaking at all.

any ideas?

 

disconnect your battery for 15 minutes.

 

I also have the same problem lol . mines pop up every atleast 20 miles, i got so tired of clearing it. hope mines goes away when i get tuned next week. did you ever tried the j pipe 02 fix?

 

Get the car tuned. It's telling you it doesn't like the mods you've used. Disconnecting the battery can just be an aesthetic fix (ie you get the CEL to go away but the problem is still happening) so be prepared if have more problems later running an un-tuned, modified car.

 

I'm sure I'll get the a-hole award for this but really this is coming from a kind place. You'll want to change the spelling of "always" in your signature; probably more befitting of your late brother that way.

 

Extender or cel fix adapter?

Edit:

You know what? Maybe it's the gas you use. I remember this one time my cel went of when running some bad gas from a Chevron station in Marina. I thought it was a one time thing but then it happened again when I went to that station.

 

Everything else is stock except a cbe and the cat. im running the stock 93 cobb map.
i got more parts coming so a tune is just gonna have to wait unless the very little mods i have on will be damaging?
for another couple hundred atleast.

 

You will be fine with just a cbe and cat. no tune required, but it would be the best thing to do.

 

That's the code everyone gets with a HFC or a Test Pipe. Like other said, either get a tune and they'll disable that code or get a COBB Accessport where it was one of the first codes they disabled!