which o2 sensor do i have to get?

**scott5** · 07-01-2007, 05:02 PM

just what the title says. I have an O/R h-pipe and i am getting a set of o2 sensors for it, but the comps all say there is four of them one before cat and one after, but since i dont have cats which ones do i have to get the ones that would go before cats or after the cats?

**Chris00GT** · 07-01-2007, 06:21 PM

The one's before the cat's or the front two are the one's that the computer uses and you need. The rear O2 sensors or after cat are just for emission and trip the check engine light. Other than that they don't really do anything. Most tuners shut them off or people buy MIL eliminators for the rear two O2 sensors. One thing is we've had the best luck with Motorcraft O2 sensors. They seem to last longer and work the best.

**scott5** · 07-01-2007, 07:19 PM

Originally Posted by Chris00GT

The one's before the cat's or the front two are the one's that the computer uses and you need. The rear O2 sensors or after cat are just for emission and trip the check engine light. Other than that they don't really do anything. Most tuners shut them off or people buy MIL eliminators for the rear two O2 sensors. One thing is we've had the best luck with Motorcraft O2 sensors. They seem to last longer and work the best.

yea thats the kind i was getting.. I was told that you can only get these at a ford dealership is that correct? I work at a ford dealership so i get a discount but i was just wondering if you can get them somewhere else that way i can do some price comparing.. I am def trying to save every penny i can

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