Do i need new o2s, or a tune?

[Lunatikgixxer]

I recently installed the extensions and im going to be getting a tune in the next week or 2. But im still getting horrible gas mileage and the car is smelling like gas here and there. Should i just completely buy a new o2 sensor (the part that screws into the header) or what should i do?

[JRENIGAR]

Im assuming you had lt's put on? If so then I'd get new o2's and a tune. The tune will really show off the headers, assuming you have the rest of the exhaust upgraded also.

[Lunatikgixxer]

Ok so both is needed, and i do have the rest of the exhaust as well. Thanks

[JRENIGAR]

dont have to but if ya dont whats the point in the headers, thats my thoughts. If your o2's arent throwing codes then probably ok to keep them. I changed mine because of the miles on my car when headers were installed.

[Lunatikgixxer]

mine ARE throwing codes, all 4 of them

[JRENIGAR]

change the front two, dont bother with the rears or sims just run the car with the rears unplugged till ya get a tune. Worked fine for me.

[Lunatikgixxer]

that was the plan. thanks man!

[JRENIGAR]

No prob!!!