yes it is changed he told me he hit a deer 2 years ago

 

I have the same problem... it's just an O2 sensor in one of the cats. Easy fix just replace the problematic O2 and maybe a cat

 

maybe i donno i got an appointmant i am going to run the codes

is it a big deal if it is on or not ?????????

it is also the orginal exhaust

 

Not a big deal. One end bolts into the cat and the other end is an electrical connector. They might be rusted in there. I have the same years as you and there are 4 sensors total. I pulled my inner ender off to get to the passengers side upper sensor. It was rusted tight and I ended up using the torch to get it out. The code reader should tell you exactly which sensor it is though.

 

i would change o2 sensors. or at least the one thats bad. It can cause the vehicle to run lean, cant it? And if it is running too rich or too lean, that can eventually damage the cats. I just learned recently that O2 sensors run a random check every 3 cycles.

 

well i might be goin in soon

do you think that is affecting the fuel milage some how i donno i can't tell

 

maybe a little bit. Im not sure exactly how much if at all it does. I would think it can because if its affecting proper fuel mixture, and ur not getting that proper mix, yes your milage may go down.
As far as taking it in....most auto parts store allows you to check you codes, and they should be able to tell you which one is bad, free of charge I may say. and changing to O2 sensor is a pretty easy fix.

 

ya i crawled under my truck to night a saw both of them sticken out one of my dad's buddys has a code reader so i might go down tommorow

 

Just change them to avoid problems, it takes maybe 10 minutes considering you dont even have to jack the truck up. The sensors I dont think cost too much either.

 

i know it might sound dumb but check to make sure the gasket on the gas cap is good.