i got o2 sensors less than 3 months ago and my car started to smell really rich and it smokes a little when i start it. Not to mention i am getting 0 gas milage. I ran a code today and it said i neededeither a new map sensor. wheich i just replaced. or its the EGr but i got my PCM tuned to delete egr so i doubt its that or o2s. How could i have ruined them so fast? they are bosch and tomorow i am going to get A/C delcos. any ideas? thanks

 

I've heard it's the best to get AC-Delco's......aftermarket o2's are known to give you problems. Always go OEM when it comes to something like that.

 

Some more info about your car's mods and any recent work might be helpful. The signature area is a good place to put mod info.

 

nothing recently on there except repair. I have hooker headers slp intake and flowmaster exhaust.