front 02 sensors to bad? I have a sealed system (not open headers/cutouts), the rears have been deleted. And the car has been dyno tuned. This is the second set of front O2's that i am going through in the past year, btw, i have the bosch 13111's

 

Too high of octane fuel can be bad for the 02 sensors.

 

They usually start going bad after a header or cam install.
After a cam install cause they don't like raw fuel hitting them.

 

i have gone thru a couple since my cam install, I am going to get it retuned here pretty soon. hoping that I don't have to put new ones in for a year. cross my fingers.

 

I have found that driving around above 1500 RPM helps them stay hotter. MY stock ones gave up and looked terrible when I drove around at 1000-1300RPM. Now that I have switched to 13111 and drive at or above 1500 RPM I have not had a problem

 

im gonna be switiching to the bosch 13111's when mine go out next. they do seem to work better.

 

well the cam has been installed for over a year now, and it is the same tune, so i suppose the under 1.5k rpms (i occassionally do that) is what is killing me

 

btw, how exactly do you tell if they are shot? I have a scan tool, but i delete it, and it comes back in like a hundred miles