would installing headers on my 2002 dodge ram 1500 4.7 make the oxygen sensor go bad im getting a trouble code P0138 and its idling a little rough i heard
the o2 sensor should last 100,000 miles my truck only has 82,000 i just put the headers in last week it was running fine for a few days then 2 days ago the engine light came on and the scanner came up with code P0138 there is also a slight gasoline smell once in a while

 

It is very easy to damage the o2 sensor when moving the cats. Check the connections first and make sure it is plugged in properly.

 

If they were long tubes there is a very good chance that the wire was damaged or not moved back far enough or something of that nature. As for the gas smell, you need to go back and re-tighten the the headers. That gasket can and will expand and shrink with the heating and cooling of your headers. I forget which is better to have them heated or cooled before you tighten them back up again but thats more than likely where your gas smell is coming from.