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Different styles of non foulers installed and none of them seem to do anything. It's kind of weird though. I got those codes probably 2-3 times right after the header install. It's been 500 +/- miles at this point and it has not come back. Will see how it goes.

So if I made the max reading the sensor would show .5v and let it work normally below that, would it trigger a code?

Ita a guy I've known my whole life. I won't be putting his name out there, but I could talk to him about another one...

I can make make it read a certain voltage. Lol. The variance/up and down is what I was really asking I guess. That sucks.

It's also strange because I don't get it all the time. I reset the code the day I posted here, and it hasn't come back. If I made it read a constant .4v -.5v would that make it not come back?

They are plugged in. I reinstalled them and have looked at them, seeing them function. They both stay around .7v. I have been logging, I don't have them with me currently.

I understand what they do. Why those codes specifically? Everything I read says you get the 0420 cat efficiency code.

Thanks for your helpful comment... I guess.

I did that. That'd why I'm looking for answers.

The truck has 58k on it now. That's the second set. No broken bolts either time. Both manifolds had a large crack in the center on this swap out.

Yes. It is tuned by livernois

But why 2271 and 2273? Instead of the normal cat efficiency codes?

I have the truck tuned through livernois. They won't turn off rear o2's. The truck also doesn't have any catalytic converters anymore. Local muffler shop made me a catless y pipe. The o2's are installed though.

I removed my cracked exhaust manifolds and replaced with shorty headers. Now I get CEL with p2273 p2271 o2 bank 1&2 sensor 2 "stuck rich". Has anyone experienced this?

I see that this is an older thread, but I agree. American Trucks is a trash company with **** POOR / NO customer service. I willingly paid full price for a Diablo sport tuner & PCM swap. Has been a nightmare. They don't tell you that you have to go to the holley website for the PCM... Says "in...