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Jan 22, 2006 | 08:32 AM

jimmy 2 Times

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From: norristown PA

what causes......

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

Jan 22, 2006 | 11:36 AM

blue01ta

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

Jan 22, 2006 | 12:06 PM

SUX2BU

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From: DFW, TX

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

Jan 22, 2006 | 12:26 PM

black01_WS6

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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.

Jan 22, 2006 | 05:30 PM

Cstick

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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

Jan 22, 2006 | 09:17 PM

black01_WS6

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

Jan 22, 2006 | 10:44 PM

jimmy 2 Times

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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