CPU shows me O2 sensor code. How I can determine if the sensor went bad or there is something with my emission?

 

Swap the sensor on that bank with the corrosponding bank on the other side then clear the code. If the problem follows the sensor, then it's shot.
If the problem stays in that location, you have an exhaust issue...

 

I replaced the catalyc converter 2 weeks ago. SInce then I have the code. But one day my mechanic reset it and since I drove off his garage the check engine light come back on.

 

I love you guys who fail to give a full account. You may want to tell someone you altered your exhaust system and THEN the code generated.

What specifically is the code? It could be as simple as the fact you have a better flowing cat than stock, in which case a small piece of steel wool would fix you up.

Need more information to determine the fix...

 

I don't know the code exactly. My mechanic scan the dodge,and he told me is a O2 code.
I'm sorry I forget to mention the replacement. The guy who replaced my catalyc converter install a universal one for $200. Maybe this is the reason?

 

High flow cats can cause a code to pop up. What year is your truck? try the key trick to get the codes (cycle the key on/off/on/off/on without starting the truck and a code should pop up on the odometer screen). Or if you have a tuner you can get it that way. Or go down to checker or autozone and have them read the code for free.

 

Okay. I'll try. Let you know ASAP. The truck is 1998 DOdge Ram 1500 4X4 SLT Laramie
Thanks

 

I'm gonna move this to 2nd Gen Ram since that is what your '98 is...