i had my check engine light on for about 3 weeks now due to my test pipe, now this mornit went off?/?
can the check engine light put my car into limp mode after a while or no?

 

The CEL does nothing but light up j/k

Yes, an error code can, but not in this case (Secondary O2 sensor)

 

What sackdz said, but I'd check the code anyways just to make sure it's a code 67..

 

how do i check the code. ?
also why would it just go out like that ?

 

here's a how-to on checking the code.. very easy to do http://www.bseries.net/html/garage/engcode.php

As for going out, I THINK 67 will do that, but I'm not 100% sure. It checked for a differnet a/f reading. Wrap it in tinfoil and pull it up into the pass compartment.

 

It will not put your car into limp mode.

 

well it went back on , but mayber it feels slower , cuz i justr put the int back in , ???
oh well , thanks guys