A/F gauge reading

[Midnightride]

Ok, so I have replaced the front O2 sensor, and when I installed the 3" turboback exhaust I reused the rear O2 sensor. When I turned the car on the reading is basically completly in the red. Lean reading. When go WOT, it does jump completly to the green (rich), and stays there. It doesnt go back and forth at all. Before the 3" turbo back install it would atleast go back and forth for most part. I thought it was the O2 sensor, thought I might have damaged it when i welded, so I replaced it but still get the same reading. I do have a 3" high flow magnaflow on there so it is getting some kind of backpressure. I wasnt sure if that was the issue maybe.

Anyone have any suggestioin on what it could be? I just dont want that to be a true reading, I do know they arent that reliable, but just thought it was weird how it was working before and now its not going back and forth.

could a exhaust leak cause this issue?

 

[95TalonOwner]

You can't really rely on those gauges unless you have a wide band a/f gauge. The narrow band gauges are pretty much just a light show.

 

[Midnightride]

yea I know they are'nt that reliable, but I just think it should work the same or give the same reading. It has a new fuel filter too so Its not that.

I realize those are just for light show, but im not getting a light show and that worried me a bit. Since it gets it signal from the wire going to the ecu, it wondering what the ecu is seeing. Just want to make sure all is good.

 

[dave99gst]

even with a exhaust leak it should still do what it did before.
Cycling is the sign of a heathy o2 sensor.